I'm no expert but maybe trying to post your art on multiple site might help you reach a wider audience and potential client

there is ych.commish.com I often use for finding art auctions. it can be used to set up auctions of your own. I have sell one of my characther on the site I while ago

deviantart doesn't allow porn but if you don't do NSFW art to begin with I believe they have no problem with furry SFW image

e621 doesn't allow YCH auction but you might be able to post a link to your furaffinity page in the description thought I don't know how effective that would be

inkbunny (i never used it personally but i know it exist)

twitter maybe

Really thank you for your detailed response!
💚 It's important for me .