@maxmp @adsubzero I've found an app called SmartHerz, that forces apps to 120hz, there's a root and non root version. Installing it via the playstore it's the root one, search it on google for the other version.
There's a tricky setting when installing it it will ask you to remove battery optimization to the app, to do that since it is made for an older version of android, you will have to allow background activity.
I Hope this helps for others with this issue.