One bypass way that used to work and probably still does is to rewrite the activity i.e modify the apk to start your own activity in which you add a login and sign up button then link those buttons to invoke their respective NDK functions from the games library so that you can still play the game with your mod menu. Hope this helps, Good Luck!
You need bypass it, and mod apk in free fire always make account banned, maybe you can try change to lua script or mod menu injection, some function it's safe like rain bullet, I use since ob 19 and my account dont ban
You need to bypass the game because there is an anti-cheat system running in the game so some careless modifications will be detected as a result your account can be banned permanently.