I haven't read the other comments, but I have been in the same place mentally. Just getting sick of the volume and wanting to pare down.
IMO it helps to first determine where there are redundancies. If you have 5 black jackets, for example, or three brown boots, or 20 dressy tops. Then, say, take those 5 black jackets and try them on with outfits... there are probably one or two that are more versatile than the rest... maybe they go with skirts and jeans or can dress up and down, while others can only be worn one way. Keep the versatile ones and let the others go!
Next it helps me to think of the other size of the spectrum - where is there infinite variety? I used to have every color of jacket under the sun, but they didn't all go with my tops and jeans etc. So limiting the colors to just the most favorite and flattering helped a lot. This can help cut volume fast once you start purging all the red for example.