I can relate...
I have a small ranch house with a storage building out back, that I have lived in for nine years. After two years, I had finally made some progress on going through my own junk, cleaning out one bedroom to become a library--something I've always wanted--and making the storage building usable, not just for storage, but as a workshop. No sooner had I begun making progress on this then my parents announced they were moving into a retirement community, downsizing from their 4,000+ sq.ft. house with a four-car garage in the back, to a 1,300 sq.ft. apartment, about the same size as my house. For six months, I tried to help them sort through stuff, although to this day, I'm not sure what was really accomplished, other than moving boxes of stuff that had been unopened for decades from one spot to another, and bringing stuff back to my house by the car/van load. They made the actual move in the fall of 2016, Dad passed away in the winter of 2018, and now, I can't walk in my storage building or the guest bedroom, and I also have a rented 10 x 20-foot self-storage unit for my Dad's toy collection (antique electric trains, die cast car models, etc.) that's costing me almost $200 a month. I was selling stuff on eBay for a few years, and made some decent extra income, but eBay and PayPal fees, higher shipping costs, and now the IRS, if I sell more than $600 a year, have taken all the meat off of that bone. I've considered renting a booth at an antique mall (same tax issues would apply), but I'm rapidly getting to the point where a big ass auction is looking like a good idea. I just need to figure out the logistics of pulling that off.