Many lovely things there!
I’m probably the worst person to answer this, because I tend to get stuck in analysis paralysis & never pull the lever, except for spontaneous buys, but here are my ideas.
It is easy for me to fill up an online cart, play the paper dolls game of this goes with that, but could also work like this… and then walk away, just like paper dolls. Can you let the fun be in the looking and making sets, rather than getting the things?
On ylf, people have different styles and comfort zones. I admire Style Fan’s earth tones and trendy pants shapes as much as I do Irina’s architectural daring, but I know neither is for me. Maybe you could practice the same irl, noticing how something about your friend’s new item that really suits something about her, so you aren’t thinking of it for you.
One other “thinking of others” idea—gifts! I’m sure there are women you buy presents for occasionally. Maybe the next time you have the urge to shop, you can think ahead to the next few birthdays, even if you don’t buy them clothes at all in the end. It just gives you an excuse to look that isn’t you.
Or instead of finding different ways to look at looking, you could play in your closet, make outfits with the new stuff, plan fantasy travel capsules (a favorite of mine) and the like.