I've seen people making millions of dollars selling NFTs on popular blockchain platforms. Things that were thought to be worthless are now worth a ton of cash. While all of this sounds great, it's not easy to create a unique NFT that would gain demand on the market. High gas fees on the ETH blockchain, makes it unprofitable to sell NFTs on it. Binance Smart Chain would be a better choice, but mainstream adoption on the platform is still low these days (when compared against Ethereum).
I'm wondering how do I make money with NFTs? Some guidance would be greatly appreciated. Thanks in advance.

This is incredibly difficult to do, we know that you cannot make money as a trader of NFTs as those assets on average are having a silent crash and most likely they will never recover taking into account that you do not really own anything even if you pay a fortune for the NFT, the only real option is that you are already someone established, basically someone that is famous on the Internet or an artist and then sell your work that way, if this is not true I would not bother trying to make money with NFTs.