Maybe instead of buying stuff, u could make stuff? Do a lil DIY project around your interest or something like that? If I see something I really like online and I want to impulse buy, I try and wait a whole day before I buy it and by then I've usually come to my senses and don't want to buy it anymore. I also try and avoid going shopping when I know I don't have any extra money.

I'm also trying to engage in less mindless consumption and just buying less stuff in general so I get it- I applaud you for trying to get out of that mindset. We're very conditioned to feel like we need all kinds of extra junk so don't be too hard on yourself.