If I like cryptography, programming and pure math, what should I do and build in crypto?

Maybe something adjacent to Terraforms by Mathcastles

These look cool. What is adjacent to Terraforms? Exploring other shader/generative-like NFT projects?

https://youtube.com/watch?v=U2xTl5pPHwk

The discord is a fantastic resource, not just for the project, but for accessing the community. Lots of developers working on varying projects from onchain rendering to math based graphics and openly asking questions, and none of it is token gated.