you have a problem in your .htaccess because multiple
RewriteEngine on
only once this line can be used
every time you use it the server quits everything it did and starts all over again
and then slowly add the code that people suggested you
but only once that you have at the beginning this line RewriteEngine on
btw.
purge all cache from cloudflare !
Purge everything
https://support.cloudflare.com/hc/en-us/articles/200169246-Purging-cached-resources-from-Cloudflare