If error 500 occurs when opening the site, it may be caused by the presence in the file .htaccess unsupported parameters.
In this situation, you should check the contents of the file .htaccess and, if necessary, make the appropriate edits to it:
Options +FollowSymLinks- needs to be replaced with
Options All -Indexes- needs to be replaced with
+ExecCGI- you need to delete.
The hosting does not use the Apache module
mod_version, so if in .htaccess there are blocks with directives
IfVersionthey should also be removed, leaving only the contents of the Apache 2.4 blocks.
Also on hosting you cannot use
RewriteMap... If the goal is, for example, to transform URL in lower case, it is better to solve this problem by adding the appropriate directives directly to the PHP scripts of the site.