Look for things that are both hard to verify and important to verify.
Middle-management paper-pushing is hard to verify but nobody was verifying it exactly anyway. Few people really care if your proposal to do Thing A vs Thing B is 100% correct and fewer have the ability to tell.
A lot of software is easy/fast to verify, despite being important to verify.
But there's a lot of niches out there even in software and software-adjacent things where verification is slow, costly, and/or hard. Where an agent can't write mediocre code but speedrun its way through six iterations of unit tests, code fixes, test fixes, code fixes, etc.
And because their niches, there's room to carve stuff out. If you're OpenAI there's diminishing returns on specifically targeting the ability to one-shot every specific niche in the world.