Conflicting plugins break site

Try debug to see the error: https://wordpress.org/documentation/article/debugging-in-wordpress/. Check also wp-content/debug.log or any other configured log files for exact error.

If the site is not working (blank page), disable plugins (just rename the plugins folder to “_plugins”).

If you know which plugin is problematic go to plugins folder and rename the folder plugin: (plugins/_the_plugin).

At least I followed these steps last time and I was able to login in admin dashboard.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)