Sell NFT on Ethereum Mainnet for free

Hi Folk!
I think that the NFT hype has long lost momentum and relatively unknown artists hardly have a chance to sit on their NFTs without the appropriate community.

In addition, the hurdles are too high for many artists who want to dive into the NFT world. The creation of the collection costs money first, and then the actual provision of the NFT.
Yes, of course, this is also possible for free on OpenSea, but then not in the Ethereum mainnet but on Polygon. But this has the disadvantage again that a large part of the community hangs around…