One thing that I still have tonnes of is supplies. When I moved house 6 months ago I was somewhat disciplined and sold off a lot of buttons and fabric, but I couldn't bring myself to get rid of all of it. I had lived in that house for seven years so there was a lot of clutter and unwanted life garbage that was clogging up my space. Moving was a great excuse to sort through it, downscale, see what I wanted to keep, and see what was good for selling.
I reopened my Etsy supplies shop a few months ago and have been tipping away with some sales without having to put too much effort into it. I should really be less lazy and do a few days of photography and listing and properly figure out what I have. For the moment I have about 100 listings of buttons, knitting supplies, pincushions and other miscellaneous items. If I was a more organised person I could easily bring that up to 250, I'll get there eventually!