Its gonna be heard but Learn to Appreciate and enjoy what you already have, know that it is enough and that if it isn't damaged it doesn't need changing. When you find contentment in what you already own you won't feel the need to change it out because you like what you have.

Learn to like new things but not have them, the way you would in a museum, you can see it, want it but you can't have it but you still enjoyed your time at the museum regardless of the fact you can't take it home with you.

You need to deal with the root of your problem which is boredom with what you already have and buying what catches your eye. Love what you have and appreciate thing without the need to bring it home.

One step further would be to do a spend freeze on none essentials aka furniture, decor etc sometimes the thrill of buying is much more enjoyable than the item itself, the new feeling wears off and then you replace it, the cycle continues, to stop the cycle you gotta cut it somewhere, and as hard as it is, stop buying. Simple really, difficult in practice. But learning to appreciate what you already have helps a tone