I messed up my website URL and now it says Error establishing a database connect

Okay so I accidentally changed my URL in my wordpress site and the site got all messed up. The homepage was there but the CSS was not there and nothing else was there besides the homepage. Then I went to log in to my phpmyadmin but could not remember the password so I reset it then when I logged into it I went to the databases to switch the values of the URL but the value was no different from the original but it did not get fixed it got worse. Now when I type in my URL it says Error establishing a database connection. Please help me figure this out. I’m freaking out that the site is no longer up running.

Thank you!