Cannabis is without a doubt one of the reasons I was even able to quit other substances in the first place.
I used cannabis a lot when coming off of amphetamines, booze, opiates, Benzo's and an SSRI all at once. It was incredibly brutal and punishing and weed was the only thing that helped. It seriously made things more tolerable because I was a total wreck and my moods and emotions were all over the place, it was painful. I basically traded my addiction from the "harder" stuff to just weed.
As the OP stated, they don't want to just trade in their addiction for weed because they're still getting high and I understand that. At least for me, I got to a certain point about a year after quitting the other substances where I was finally able to sit down and tell myself, okay, now it's time to cut back on the cannabis because I got into a rut where all of a sudden I was smoking all day long from morning until night. Anytime I felt at unease, frustrated, confused, even happy, or afraid to do anything, I'd spark up. So I came to a conclusion that while I may not be damaging myself as bad as I was with the other stuff, I'm still using cannabis as a way to escape and get high. I had to change that way of thinking and act on cutting down, slowly.
I still smoke, it's still a struggle but it's no longer a daily thing. I have pretty much no desire to go back to any other substance ever again. I prefer being sober most of the time now, something I never thought I'd ever say or feel. It has worked for me, but it has been a 3 year process and a lot of ups and downs. I wish you the best of luck OP!