Figuring out how to fix problems.
Fusion will be handy for a great many things.
I'm waiting on autodocs, going to make the system ACTUALLY fix problems with the healthcare system. We'll have to figure out a way around the fact that there are very few jobs that probably won't eventually be mechanized, but that's a matter to deal with a bit down the line.
And yet more power generation that isn't terrible. A web of these under the skin might someday power implants or whatever.