[tmaly]

Battery technology, specifically non-lithium. I see the efforts to get rid of gas powered cars, but I see battery technology as a potential blocker.

Decentralized Finance - seems some very interesting things could come out of this.

3D printing in the consumer space. I have heard they print jet engine parts now. I can only imagine what people who tinker at home can come up with as the technology improves.

Hardware based ML models, imagine having a gpt-3 model on a chip that fits in your pocket? This would be something right out of a William Gibson novel.