Fields that may grow: medical services and support, small-scale short-distance tourism (after 6-12 months), small scale web dev, military spending, government support and consultancy, space[2].
Basically a bimodal economy with a lot of money coming directly from government spending instead of via investors, but some small-scale green shoot opportunities for small local-interest businesses. The big corporates will survive, but with job losses and a general contraction. Medium-sized businesses and wannabe-unicorn gamble startups will be hit hardest. (Some will be ok. Many won't.)
[1] You might expect it to grow, but supply chains are going to be damaged and most people are going to have less money. Some people will have no money at all. Selected narrow sectors may buck the trend.
[2] Because there won't be a lot of other obvious places to invest. Also, everyone loves a bit of drama and optimism.