No Cache Plugins working with wordpress

I have three websites on my hostgator shared server (sprybag.com, purplepinkstore.com, yagneshplastics.com).
A few weeks ago everything was working fine. But yesterday when I checked my website speed on gtmetrix and pingdom, i get the “Leverage Browser Caching” error. I have Wp rocket and wp total cache installed on the websites, but none of them are able to create cache.
I am working with wordpress since quite a few years and have never faced this issue before.
I cannot contact wp rocket support because My licence has expired. Total Cache support is literally dead. So no help there.
Any one has any suggestions?

PS- Here’s my htaccess file content

# BEGIN WP Rocket v2.9.9
# Use UTF-8 encoding for anything served text/plain or text/html
AddDefaultCharset UTF-8
# Force UTF-8 for a number of file formats
<IfModule mod_mime.c>
AddCharset UTF-8 .atom .css .js .json .rss .vtt .xml
</IfModule>

# FileETag None is not enough for every server.
<IfModule mod_headers.c>
Header unset ETag
</IfModule>

# Since we’re sending far-future expires, we don’t need ETags for static content.
# developer.yahoo.com/performance/rules.html#etags
FileETag None

# Send CORS headers if browsers request them; enabled by default for images.
<IfModule mod_setenvif.c>
<IfModule mod_headers.c>
# mod_headers, y u no match by Content-Type?!
<FilesMatch "\.(cur|gif|png|jpe?g|svgz?|ico|webp)$">
SetEnvIf Origin ":" IS_CORS
Header set Access-Control-Allow-Origin "*" env=IS_CORS
</FilesMatch>
</IfModule>
</IfModule>

# Allow access to web fonts from all domains.
<FilesMatch "\.(eot|otf|tt[cf]|woff2?)$">
<IfModule mod_headers.c>
Header set Access-Control-Allow-Origin "*"
</IfModule>
</FilesMatch>

<IfModule mod_alias.c>
<FilesMatch "\.(html|htm|rtf|rtx|txt|xsd|xsl|xml)$">
<IfModule mod_headers.c>
Header set X-Powered-By "WP Rocket/2.9.9"
Header unset Pragma
Header append Cache-Control "public"
Header unset Last-Modified
</IfModule>
</FilesMatch>

<FilesMatch "\.(css|htc|js|asf|asx|wax|wmv|wmx|avi|bmp|class|divx|doc|docx|eot|exe|gif|gz|gzip|ico|jpg|jpeg|jpe|json|mdb|mid|midi|mov|qt|mp3|m4a|mp4|m4v|mpeg|mpg|mpe|mpp|otf|odb|odc|odf|odg|odp|ods|odt|ogg|pdf|png|pot|pps|ppt|pptx|ra|ram|svg|svgz|swf|tar|tif|tiff|ttf|ttc|wav|wma|wri|xla|xls|xlsx|xlt|xlw|zip)$">
<IfModule mod_headers.c>
Header unset Pragma
Header append Cache-Control "public"
</IfModule>
</FilesMatch>
</IfModule>

# Expires headers (for better cache control)
<IfModule mod_expires.c>
ExpiresActive on

# Perhaps better to whitelist expires rules? Perhaps.
ExpiresDefault                          "access plus 1 month"

# cache.appcache needs re-requests in FF 3.6 (thanks Remy ~Introducing HTML5)
ExpiresByType text/cache-manifest       "access plus 0 seconds"

# Your document html
ExpiresByType text/html                 "access plus 0 seconds"

# Data
ExpiresByType text/xml                  "access plus 0 seconds"
ExpiresByType application/xml           "access plus 0 seconds"
ExpiresByType application/json          "access plus 0 seconds"

# Feed
ExpiresByType application/rss+xml       "access plus 1 hour"
ExpiresByType application/atom+xml      "access plus 1 hour"

# Favicon (cannot be renamed)
ExpiresByType image/x-icon              "access plus 1 week"

# Media: images, video, audio
ExpiresByType image/gif                 "access plus 1 month"
ExpiresByType image/png                 "access plus 1 month"
ExpiresByType image/jpeg                "access plus 1 month"
ExpiresByType video/ogg                 "access plus 1 month"
ExpiresByType audio/ogg                 "access plus 1 month"
ExpiresByType video/mp4                 "access plus 1 month"
ExpiresByType video/webm                "access plus 1 month"

# HTC files  (css3pie)
ExpiresByType text/x-component          "access plus 1 month"

# Webfonts
ExpiresByType application/x-font-ttf    "access plus 1 month"
ExpiresByType font/opentype             "access plus 1 month"
ExpiresByType application/x-font-woff   "access plus 1 month"
ExpiresByType application/x-font-woff2  "access plus 1 month"
ExpiresByType image/svg+xml             "access plus 1 month"
ExpiresByType application/vnd.ms-fontobject "access plus 1 month"

# CSS and JavaScript
ExpiresByType text/css                  "access plus 1 year"
ExpiresByType application/javascript    "access plus 1 year"

</IfModule>

# Gzip compression
<IfModule mod_deflate.c>
# Active compression
SetOutputFilter DEFLATE
# Force deflate for mangled headers
<IfModule mod_setenvif.c>
<IfModule mod_headers.c>
SetEnvIfNoCase ^(Accept-EncodXng|X-cept-Encoding|X{15}|~{15}|-{15})$ ^((gzip|deflate)\s*,?\s*)+|[X~-]{4,13}$ HAVE_Accept-Encoding
RequestHeader append Accept-Encoding "gzip,deflate" env=HAVE_Accept-Encoding
# Don’t compress images and other uncompressible content
SetEnvIfNoCase Request_URI \
\.(?:gif|jpe?g|png|rar|zip|exe|flv|mov|wma|mp3|avi|swf|mp?g|mp4|webm|webp)$ no-gzip dont-vary
</IfModule>
</IfModule>

# Compress all output labeled with one of the following MIME-types
<IfModule mod_filter.c>
AddOutputFilterByType DEFLATE application/atom+xml \
		                          application/javascript \
		                          application/json \
		                          application/rss+xml \
		                          application/vnd.ms-fontobject \
		                          application/x-font-ttf \
		                          application/xhtml+xml \
		                          application/xml \
		                          font/opentype \
		                          image/svg+xml \
		                          image/x-icon \
		                          text/css \
		                          text/html \
		                          text/plain \
		                          text/x-component \
		                          text/xml
</IfModule>
<IfModule mod_headers.c>
Header append Vary: Accept-Encoding
</IfModule>
</IfModule>

<IfModule mod_mime.c>
AddType text/html .html_gzip
AddEncoding gzip .html_gzip
</IfModule>
<IfModule mod_setenvif.c>
SetEnvIfNoCase Request_URI \.html_gzip$ no-gzip
</IfModule>

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{HTTPS} on [OR]
RewriteCond %{SERVER_PORT} ^443$ [OR]
RewriteCond %{HTTP:X-Forwarded-Proto} https
RewriteRule .* - [E=WPR_SSL:-https]
RewriteCond %{HTTP:Accept-Encoding} gzip
RewriteRule .* - [E=WPR_ENC:_gzip]
RewriteCond %{REQUEST_METHOD} GET
RewriteCond %{QUERY_STRING} =""
RewriteCond %{HTTP:Cookie} !(wordpress_logged_in_|wp-postpass_|wptouch_switch_toggle|comment_author_|comment_author_email_) [NC]
RewriteCond %{REQUEST_URI} !^(/checkout/(.*)|/cart/|/my-account/(.*)|/wc-api/v(.*)|/wp-json/(.*))$ [NC]
RewriteCond %{HTTP_USER_AGENT} !^(facebookexternalhit).* [NC]
RewriteCond "%{DOCUMENT_ROOT}/wp-content/cache/wp-rocket/%{HTTP_HOST}%{REQUEST_URI}/index%{ENV:WPR_SSL}.html%{ENV:WPR_ENC}" -f
RewriteRule .* "/wp-content/cache/wp-rocket/%{HTTP_HOST}%{REQUEST_URI}/index%{ENV:WPR_SSL}.html%{ENV:WPR_ENC}" [L]
</IfModule>
# END WP Rocket

# Yoast SEO - XML Sitemap Rewrite Fix
RewriteEngine On
RewriteBase /
RewriteRule ^sitemap_index.xml$ /index.php?sitemap=1 [L]
RewriteRule ^locations.kml$ /index.php?sitemap=wpseo_local_kml [L]
RewriteRule ^geo_sitemap.xml$ /index.php?sitemap=geo [L]
RewriteRule ^([^/]+?)-sitemap([0-9]+)?.xml$ /index.php?sitemap=$1&sitemap_n=$2 [L]
RewriteRule ^([a-z]+)?-?sitemap.xsl$ /index.php?xsl=$1 [L]
# END Yoast SEO - XML Sitemap Rewrite Fix
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress
# Wordfence WAF
<Files ".user.ini">
<IfModule mod_authz_core.c>
	Require all denied
</IfModule>
<IfModule !mod_authz_core.c>
	Order deny,allow
	Deny from all
</IfModule>
</Files>
# END Wordfence WAF