There is an incompatibility issues with WP Rocket and Admin Tools which causes users to receive a 403 error when visiting the website.
I have got this a lot and the only way to solve it is to log into my hosting and rename the plugins folder for Admin Tools adding _bak on the end for instance.
See here:
https://docs.wp-rocket.me/article/706-resolve-403-forbidden-error
I think the .htaccess file generated by Admin Tools is the problem, I’ve deleted all the caching directives that it includes in case they conflict with those from WP Rocket. I’ll see if this solves it.