To be honest you can do anything with NFTs , the only limitation is your imagination
A few ideas -
1. Have NFTs that you collect/ buy but have a ‘ closing date ‘ - ie, you can get them but they only last 1week/month etc and then are burned.
2. Like example above , but have an ‘opening date’ , ie, you can buy them but can’t use them until a certain date.
3. Have surprise NFTs , ie, you can buy/ collect them but you don’t know what they are until you ‘open ‘ them. These ‘surprise NFTs’ can be traded , ie, take a chance on what you are going to get ?
4. NFTs can maybe get burned and upgraded- free or cost .
These are just a few ideas that can help game play ?
Hope this helps a bit.
It may be worth taking to some folks who develop NFT trading games , don’t know if there’s any of these folk on the forum?