Website has 500 error

I installed ithemes security, updraft plus backups plugins and set them up with security for the site and backup schedules. I also enabled automatic updates as nothing had been updated on this site for a while.

The site was working fine after setting this up (not cached as tested on another device). Then the next day its down with Internal Server Error initially and now it just shows page isn’t working properly.

What I have done:

Disabled plugins via ftps rename trick
Reset .htaccess to just the WordPress basic
Checked hosting capacity

Can’t check hosting logs yet as its not my hosting and requires approval to do it which have requested. Any ideas on what could have caused this I am assuming it’s something I setup

 

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