you may be able to pop the arm off from the underside of the window, if you need to close it for now. Remove the arm assembly so you can tinker or replace later. check the inside of the arm, maybe its stripped and you only need a new arm. if its the assembly that's stripped, you'll likely need to replace it all.

I feel really judged rn..

<thumbs up>

wyze cam in your basement pointed at the floor. done.