Theymos rarely new boards, except when he adds them for new languages when there's enough demand.  As for child boards and anything dealing with non-bitcoin subjects, I suspect he's not eager to add any more than already exist. 

I can't say I know much about blockchain games or what their future prospects are, but even if they were scorching hot right now, it'd still be way too early to add a subsection.  Same thing with NFTs.  Can you imagine if Theymos had added an ICO child board back in 2018?  ICOs were a popular fad, but that's all they turned out to be, and it took quite a bit of time to determine that.  In hindsight, currently irrational people might come to realize that there's nothing special or collectible about digital art that just happens to be linked to a blockchain.  See my point?

There have been many, many proposals for new sections over the years and I'm not sure if I've ever seen one acted on by Theymos.  That's what you're up against, OP.