What do you mean "cant be accessed"? you can not access frontpage or backend? Did you try to access different browsers? Incognito mode?sorry, may i ask here? i have a problem, why when i try to deactivate this wp rocket plugin my website can't be accessed? the warning that appears is to clear the browser cache, but still my web is not back to normal. I've tried deleting this plugin's data via file manager. but nothing has changed. I finally restored my website again.
Note: Previously I used shared hosting, I recently migrated to vps.
And otherhand, when you uninstall and/or delete plugins (most of them) it still stored in database and also kind of this plugin modify htaccess file too, you should check if there is any line from wp rocket.