Ask HN: What is a niche in tech that you think has a big future?

I think of myself as a relatively good software engineer (based on feedback), but I never specialized in anything. So I am here with 12 YoE but I don’t stand out with anything. I know the boring Java/Javascript/Python/AWS/etc. stack, and use these to write boring REST apis or data processing pipelines.

Edit: by boring I mean: there are too many people with the same knowledge/experience.

What is something that I could start specializing in now? Something with a big future.