Here are some options. Some may suit you better than others...
1. Sell on Etsy (as you mentioned, they are now cracking down on the business side of things) They take their percentage and you compete with everyone else on the WWW.
2. FB marketplace. As you mentioned you have not had much luck on there. People are really looking for deals on stuff and doesn't lend itself well for fine leatherwork. I have put items there on the lower end of pricing and have actually gotten some custom requests doing that. Not a huge fan.
3. Setup your own website - pricey. Then you have to drive traffic to it and that can get pricey too.
4. Word of mouth. It would be cheaper to make some items and give them away to friends and family so the neighbors can see your fine work. Takes a while, but you could always hang out a shingle near the road by your house.
5. Setting up at trade / craft shows like a Ren-Faire or motorcycle show, etc. The booths, etc can get quite expensive and it is a time-hog. You have to be there the entire time.
6. Find a local shop that will either buy your items or allows for consignment in their shops. I have 2 local shops where I sell my wares.
Each of these could use some elaboration and there are many threads on each one of these types on the forum.