Going into sewage vats and breaking up solidified waste and oil clogs
Deep sea oil rig repair
Underwater dam repair
Driving public transportation (not enough to maintain a system)
Elder care (there is a worldwide lack of people willing to clean up piss and shit of often angry, sometimes aggressive people and deal with regular loss for bad pay, much less in an ideal profession freedom world, relative to the amount of people needing care)
Forensic pathology is something that very very few people enjoy also, but is very needed.
Urine farmer (hunting luring, sprays for animal repellant)
Coal miner
Any precious or rare metal or stone miner
People love intellectual jobs, creative jobs, and some public service jobs. It is much much harder to find people to do body-destroying terrible-condition manual labor jobs. Ideally those are the jobs to be replaces, but of course capitalists want to replace the former category of jobs because those cut into their profits more.
They should be the default for solar installations and grid-level storage, but are too new.
They can also replace lead-acid batteries for many applications.
Lithium will still rule microelectronics and wearables, but all lower density stuff should switch to sodium.
That being said, for cold environments like Scandinavia and the US Midwest & canada, sodium ion works better in both cold and heat swings than Lithium variants that it might be worth the tradeoff in capacity because in the long cold months, the reduced capacity and performance of lithium chemistries would completely close the gap anyways.