I think my dad is trash
What about your father makes you think he is trash?
Because he rejects all my advice that I give him.
There might be a reason he rejects your advice. You should try to help people who want it and move on if they don't.
He just needs to listen to me. I just want to help him.
I understand that, but ultimately it is his decision. You don't have to give up on him, but maybe give him some space.