phpMyAdmin My Setup Username and Password not Working Anymore (no replies)

I have setup MySQL with specific username and password. I can login several times. But suddenly, phpMyAdmin only accept root without password.
So i can't connect to my database. How to recovery this issue?

Edit: I use MySQL 8.4, where to check which version is running and switch it?
Ops... MySQL Version: 8.3.0 is running, my database in MySQL 8.4

Thank you