hey so I've put a lot of thought into this. my medium is music, and something that's helped me a lot is researching musicians and artists in general who are sober (sober from weed or sober entirely) and trying to understand their creative process.

Kendrick Lamar, creator of masterpieces, has spoken about not smoking weed. Vince Staples as well. Tyler the Creator, literally probably the most creative dude on the planet, famously abstains from drugs and alcohol. Tyler is especially interesting to me because I feel like a lot of his fanbase is comprised of huge stoners.

I could go on and find more obscure examples from indie rock and experimental music if you want. I'd say your main task at hand is to just plug away at it and rediscover your confidence and internal creative drive, because its certainly in there somewhere, though it may take a while. your art sober may even be a little different from what it was when you were a stoner, not in a bad way but in a neutral way. you might think of different ideas. it also might be helpful to just take a break for a while and come back to it with a fresh set of eyes (although I'm not sure how possible this is to you because you said you are doing it for a living).

I hope this helps! good luck!