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

Some of my friends got interested in that just before the hype. I like prediction markets. Except standard financial instruments, whats interesting in DeFi AMM

> Huge impact (xyk Uniswap is the most important innovation in crypto imo)
> Lot of research in the ecosystem
> Still a small market, but big enough to get funding and trying hypothesis

Prediction markets are also cool, but seems to lack traction in crypto