Im trying to quit marijuana slowly but my voice has changed cant acsess my high register can i continue quiting slowly? or do i have to quit right now

Just quit: You are just delaying things by "weaning" yourself off THC. There is no need to do this - you are not going to have physical withdrawl symptoms like with some drugs. You can and should just quit. Tell yourself this is bad, I don't need it, my body and life are more important to me than inhaling the smoke of a weed that kills my brain cells. And then just do it. No more excuses, no more weaning.