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There's too much bureaucratic red tape in medical research, so forget that. You could develop a proper antiviral for COVID and then watch your deserved fame fizzle with tentative page-10 news reports, establishment inertia, and such, unless you let some pharmaceutical company put its name on your research and take all the credit.
Any kind of physics that requires access to expensive resources -- drop that because it will usually mean sharing credit with half a dozen other people who've also been 'let in'.
I like math because the only real access you need is an Internet connection and pirate access to textbooks and journals, and if you were to dump a significant result online, your fame would be almost immediate.