Whilst I was browsing this morning I came across a post of some leather dogs collars tooled with animals and lined with a nice green lining, now the general market for such will be tiny and a hard sell to most of us after all they soon get dirty , greasy and look worn, but I assume a few dog or pet owners showing their dogs at dog shows would pay the earth for a dog collar that really stood out, with quite a good size market for them.. many hobbyists will make their plain wallet and advertise with thousand's of others on Esty or similar sites and expect to make sales with no effort and no real marketing
You need a niche market you can exploit to the full rather than compete with thousands of other hopeful's selling the same basic items, make something different that stands out. there are millions of artists in this world few ever sell their goods at a profit that recovers the hours invested in the painting or drawing, same with writer's and many other hobbies