WordPress Admin not showing Menu and Plugins

Hey, sacadm, do you have FTP access to your site?

If so, I would recommend putting in PHP code in your functions.php file in your theme to determine what the capabilities of the user account that you’re using are:
https://developer.ww.wp.xz.cn/plugins/users/roles-and-capabilities/

It may be custom code may be influencing what you see.

Okay, good that you have access to cPanel.

This documentation page specifies the capabilities of an Administrator:
https://ww.wp.xz.cn/documentation/article/roles-and-capabilities/#administrator

I would check to see if your user account has the capabilities listed on that page via experimenting around with (the following code wouldn’t work as is if inserted into functions.php): user_can( $user, $capability );