A good start would be: try not to waste what you've learned. A starting point would be to imagine ways to improve medicine via computing. There are always ways that our information systems can be improved. It doesn't have to be an impressive field or anything, even a small problem will work. Design what you think a solution might be. Learn enough to do coding experiments with said solution. You'll iterate over it a ton. If the problem turns out to be big you will probably find yourself exploring things far off from the original problem and eventually, maybe years out, discover you've hit on something new. It might be viable as a business, or just a ground-breaking concept. Either way you will hit on it if you keep exploring.
(This is from the perspective of doing mostly non-commercial programming. In commercial work you are mostly cleaning up other people's messes; there is little of interest and few learning opportunities after a certain baseline.)
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A good start would be: try not to waste what you've learned. A starting point would be to imagine ways to improve medicine via computing. There are always ways that our information systems can be improved. It doesn't have to be an impressive field or anything, even a small problem will work. Design what you think a solution might be. Learn enough to do coding experiments with said solution. You'll iterate over it a ton. If the problem turns out to be big you will probably find yourself exploring things far off from the original problem and eventually, maybe years out, discover you've hit on something new. It might be viable as a business, or just a ground-breaking concept. Either way you will hit on it if you keep exploring.
(This is from the perspective of doing mostly non-commercial programming. In commercial work you are mostly cleaning up other people's messes; there is little of interest and few learning opportunities after a certain baseline.)