⭐ Merited by pooya87 (4)
~ If Rune users want cheaper transaction fees for their Rune-shitcoins, then USE LIGHTNING!
Or better yet, if they actually want to develop anything and not just scam people they should create a separate and stand alone blockchain and use that to create whatever they want and stop exploiting the Bitcoin protocol 
It's worth to remind you already can create NFT/token on LN using either Taproot Assets or RGB protocols. But using sidechain should be better option since you could avoid creating any transaction on Bitcoin blockchain.
That's the "what", not the "how". How do you convince NFT users to stop using on-chain Bitcoin?
IMO it's mostly not technical issue. If they still prefer using Bitcoin to create NFT even though it has slower confirmation time and far higher TX fee, there aren't many other option.