Getting organized and staying organized takes a lot of effort. Specially, over the years when you accumulate stuff, without making room for stuff you really want to have. Besides the regular shopping added to stuff we have, imagine having hobbies that need even more space, than those who don't collect to satisfy their creativity.
I have been involved in helping others with their containment of clutter. Saturday was one of those days. The elderly lady said you are really good at it. She was unable to keep track of all the stuff that had taken over her three bedroom apartment. She had bags of stuff. She is elderly, so I took the initiative in bringing the stuff in the living room to her and one by one going thru them. She had a very large tub of tapperware, so we stuffed the stuff she will need for her hobbies at a later day. Another pile was made for stuff she would give away. And stuff of no longer interest and not worth donating, went in large black trash bags.
However, if you attempt to sell your items, there are many tools and websites to sell your items. In the mid 90s I had discovered a platform, which I have to this day. I haven't aggressively promoted, however I have got some sales. It's Ecrater. I also set a Facebook page for those who sell on Ecrater at: www.facebook.com/groups/EcraterStores/ - there are some gems to discover. To go along with that page, I also have on Pinterest a special board to further promote Ecrater as well at: https://www.pinterest.com/OurDesignPages/business-news-and-sourcewww.pinterest.com/OurDesignPages/business-news-and-sources/s/ subgroup of Business News and Sources. I will add more stores there for you to discover and hopefully shop at their stores.
I am asked, where else do I sell my items. I have used various apps: