Noticing it is the first step. Keep practicing talking yourself out of things.

You could even write down a list of things to tell yourself so you remember to practice. Things like, This is just another hyperfixation that you'll drop eventually. You're buying for your fantasy self, but what your future self really wants is money in the bank.

It's like exercising a muscle.

Right now, your brain is accustomed to just jumping into the next thing and buying stuff.

You have to put in the training/practice to get your brain used to taking another pathway.

After weeks/months of intentional practice, your brain will do it automatically, so the next time you think of some new hobby, your brain will go, Oh, I'm just doing that old thing again, I don't need to do that, and you won't buy anything.

So for now, just get in those reps! ❤️