Well, GO BACK TO IT then. Seriously, you're going to need to make a real material effort to fix your problems whatever you do, and if you're unwilling to bite the bullet and muster some self-control to work on things like exercising your self-control then there is nothing anyone can do for you.
I'd guess you don't have a novelty-addiction problem, you have a problem where you're unwilling to apply yourself to hard things with long-term payoffs, and the novelty-addiction is what fills in the gap. Maybe there's some reasons for that (procrastination of emotionally difficult things in favor of mood-repair is a big deal for a lot of people) but you'll just need to deal with them.
I'd guess you don't have a novelty-addiction problem, you have a problem where you're unwilling to apply yourself to hard things with long-term payoffs, and the novelty-addiction is what fills in the gap. Maybe there's some reasons for that (procrastination of emotionally difficult things in favor of mood-repair is a big deal for a lot of people) but you'll just need to deal with them.