As others have mentioned. A budget. Either do that manually or use an app. I would say manually entering it into an excel sheet might give you the reality check you need for how much youre spending/shopping. If you budget out how much you spend on bills and food, you can decide how much you would like to save. Send that money into a 401k or ira. Invest it into a low index fund or sp500. Give yourself an allowance. This is your fun/shopping money. I dont know how to help with a shopping addicition but could try these. When you want to buy something (online) leave it in the cart for a few days to determine if you really need it. Instead of seeing a $ amount, translate it to hours work to purchase it.

If the problem is impulse control, one coping mechanism is to make it more difficult to follow through on your impulses. The more steps you have to take, the more opportunities you have to override the impulse. If you shop in person, stop carrying cards and disable tap-to-pay on your phone. Stick to cash. Pull out an amount you're comfortable spending at the start of the month, and when you run out of cash that's all your shopping for the month. If your shopping is on-line, remove your cards from the apps. Maybe even uninstall the apps entirely.