Permission issue after deactivation

Hello, trust you are well. I installed this plugin, Revivepress (formerly wp auto republish) last year in December, when I deactivated it, I lost my right to login into my website as an administrator because it was showing “you do not have access to this page”.

I tried every best to make my wp-admin work for me again but all to no avail, until I restored my recent back up… I was pained because I lost over 50 posts that were not with the back up.

Now, I unknowingly installed the plugin again and I want to deactivate and delete it now, I got to know that it was the same plugin that almost make me lose my website.

I want to deactivate the plugin now but I am afraid if the same thing happens again.

Author, please help.