I don't think there are any ways to get it back sadly you mute it, it's muted forever unless ofc someone tells u another way.
Oh ( T﹏T ) ok thnk u
That happened to me too and i lost it forever and i searched everything but theres no other solution.
Sadly you can't unmute it or get it back
try to reset in your settings
For all the people who comment thank u so much but i think I'll just forget it lol ill just let it be thnk u(⌒▽⌒)
So i accidentally press the mute it in my notif （TДT) and I don't know how to get it back