Thinking about stopping

I've been smoking almost daily for the last 5 years, I struggle with depression and anxiety and well the weed just let's me turn down the yelling in my head. I am in therapy, on medications, and am doing the work. But I am worried to let go of weed as a coping mechanism, and I am worried about falling into a spiral by not using it to cope.

All of this is to say, I think I need to quit, not totally sure how. Do people have replacement coping skills you would suggest? My head is just a scary place sometimes and I am so afraid of falling into a dark place without this crutch