أحسن الله إليكم I often find myself being unable to forbid the evil especially with my fam(mainly dad) Ik this depends on the situation but what if idk what the outcome will be? And Ik that my dad will not listen to me anyway? I find myself worrying a lot about this topic and this effects my ibadah

I'm afraid this would fall into waswas (compulsive thoughts) because your other acts of worship are not affected. Therefore, the jump to that conclusion doesn't seem to be in place. If he does not listen and you know he won't listen, then you can try different strategies: 1. Talking to somebody that he listens to, to advise him. 2. If that does not work, then you have done what you could. If you continue pressing him and pushing him, you actually might be leading him to that which is even worse. Therefore, do what is wise.