Stuck at logo bootloop

I am stuck at logo bootloop after installing magisk 19.3 zip, I was watching How to Install TWRP & Root w/ Magisk on Samsung Android! [UNIVERSAL METHOD] [Android Root 101 #2] - YouTube and did exactly as it was mentioned in the video. I flashed the magisk uninstaller and rebooted the system, but it is not working. What shall I do??

what exactly did you do? Which device?
Did you install a custom ROM?

It is solved.