I’ve found it easiest, if you’re not in a rush, to just post stuff on eBay with a fixed price and no expiration listing date. Caveat being that you’ll have to remember to take listings down if you’ll be traveling or have anything else come up that would prevent you from shipping during certain periods.
FB really is annoying. Yesterday I searched the high end bit group for a specific bit, and it showed me several year old listings and ISO posts before the listing posted 8 days ago. As a seller, it takes a lot more maintenance to keep reposting and bumping posts, managing ads in different groups and all that.