issues with render blocking, server time, browser caching

Hello

The plugin has increased my speed from 12/100 to 60/100, but I m having the following issues,

Eliminate render-blocking JavaScript and CSS in above-the-fold content
Reduce server response time
Prioritize visible content
Leverage browser caching
Minify JavaScript
Minify HTML

my site is http://www.speechandlanguagetherapy.org.uk

Any help!

https://ww.wp.xz.cn/plugins/wp-fastest-cache/