Honestly, it might be easier to pivot your business model and/or use a different channel. This seems too much like "some one else do the work to make my life easier again!!"
There are no other channels for small sellers. Etsy has spent their time on the top aggressively purchasing all viable competitors and shutting them down in order to maintain their lead.
Anecdotally: I get about 49/50ths of my sales from Etsy. They have captured a lot of the virtual storefront at least for the stuff I sell (accessories I make for board games and toys). It's almost not even worth your time to list on other sites. Did they get there through the luck, or genuine business savvy? I can't say one way through another, but they're starting to really press their advantage to extract as much money from their customers/sellers as possible.