Most games have common resources that are used for trade or building things in game these should be what the tokenomics are based on. Examples being gold and silve in most MMORPG's used to buy and sell items, great token for game. Alos steel or iron used in many games to produce weapons, armor, items, etc again another great token. Instead of resouces being sold on a game market set up liquidity pools for trading these.
In regards to NFTs I see so many of them yet games really should limit these to somethign that effects gaming such as lonad plots. Or rare items that are hard to get in game.
Of course these are onlly my own thoughts and blockchain gaming is still evolving so I may change my mind on these thoughts in the future