The economy is pretty easy to restart with cash injections as you mentioned with infrastructure projects - be it trump or biden, one of them will do it.
Many things but most obvious now would be drugs and drug compounds. China being able to refuse to sell us drugs is a national security issue. We didn't learn from the oil embargo of the 70s apparently.
Gentle reminder that the Democratic National Convention in Milwaukee is slightly less than 4 months away, and Biden is not the nominee yet.
_Anything_ could happen between now and the convention/election. Surprisingly, I haven't seen this mentioned explicitly, but all of the remaining (major) candidates are squarely in the Covid-19 "danger zone". Some are known to have complicating health factors and there's a non-zero possibility that others do (despite what their doctors' notes say), which _doubles_ the risk.