Deactivate All Plugins Using FTP
In this method, you will need to either use FTP, or your host’s file manager. Navigate to the /wp-content/ folder. You will see a folder called plugins. Rename the plugins folder to anything that you like. In our example, we will call it “plugins.deactivate”. Once you do this, all of your plugins will be deactivated.
Most of the time when you do this, you are usually locked out of your admin panel. If the issue was with your plugins, you should now be able login to your /wp-admin/.