I am so lucky to have an entire room in my house devoted to quilting. My quilting space even includes a walk-in closet for storing lots of stuff.
(No, that's not a picture of my closet.)
Unfortunately, the stuff took over to the point where my closet was a "fall-in" closet. I could not walk into it without moving boxes and bags out of the way.
The other day I had to move so much out of the way in order to find a particular fabric, that I decided to reorganize.
I culled out two boxes of fabric to donate. I repacked the rest more neatly and compactly. I made lists of contents. And I drew up a map of exactly where every project and fabric collection is.
The closet is still almost as full. You would not be able to tell much difference between the before and after. But now I can go straight to whatever I need, thanks to my map. As you can see, I left myself a space for walking in!