I don't know details, but I know there exists places to publish/purchase loop libraries for this purpose. I'm sure somebody around here can point you in the right direction (and you might have better luck asking on Discord)
I will also pass along some advice that virt once gave me: if you charge nothing, your music is worth nothing. It's fine to release it cheap, but both for yourself and for your fellow musicians it's best if you do at least charge something.