When something is missing, we buy things to fill that void.
When we figure out what's missing (it has to do with one or more of the trifecta; mind, body and/or spirit) then we don't have the urge to buy...anything more than the necessities.
Things beyond necessities we buy because of how they make us feel or the end results, not really for the item itself. If we buy a cool new car, we buy transportation to where ever we go and how cool/smart/successful we will feel when we drive it.
If your mentally have some issues or you stopped learning long ago, talk to a professional and/or learn a new hobby or take a class on something new. You could even work on your music theory
(Mind) If your out of shape, get in shape. (Body) If you feel a sense that there must be more to all this than just the egocentric you, find a religion, spiritual path or at the very least, an organization to belong to that you are part of and contribute to...even like TalkBass
I know this because I lived this and I decided I needed to change. It worxforme but ymmv!