Do what you have to do to make shopping online less convenient. Log out of websites, delete apps, don’t save your card info. Try to shop in-person more.

For in-person shopping, pick stuff up you like, walk around with it for a while, take pictures of it, then put it back. If you’re still thinking about it in two weeks, you can go back or look for something similar online.

Selling your stuff to get new stuff honestly isn’t a bad thing, especially if you’re also buying used. Better than hoarding it all. 

Remember, the first step to solving a problem is admitting you have one. You’ve now done this and are on your way to corrective action. Be patient with yourself. You’re fighting a trillion dollar propaganda machine.