On shared hosting Cloudflare can help but there is no server optimization.I heard more about two caching solutions but not tried yet.
I think Cloudflare and optimize your server are one of best methods to speed up your Wordpress website.
You are right WP Rocket is great plugin but it is premium plugin. WP super cache and w3tc are free ones.I have used both of these plugins and was mainly using W3TC but it started having issues with some other plugins not working right so I stopped using it.
I found one that is a lot faster and works better called WP Rocket and that's what I use now.
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