Same for me, the drugs were easy to file away, did that (with a few one-offs) for a few years before I got sober at 28. The booze required actions on my part to stay sober, as getting sober was something I often did and was temporary, as in a few months.
At 24 I'd gone to a few AA meetings and therapy, and different methods of controlled use, and some fringe religions, self help books, aversion therapy, self-hypnosis, vitamin therapy, herbal therapy...got serious about doing the AA stuff at 28, that's worked since.
I've gone to meetings in the Midlands, Lake District, around Hadrian's Wall and London...some decent members all over. You ask, they'll help.