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If you're interested in mechanical, electrical, and computer engineering, you should look into electronics engineering technology. It's sort of a combination of those three.

There are some jobs where they have to hire US citizens. Security jobs etc. But you sit in a vault so those jobs kind of suck.

Consider creating some fake resumes and sending them out with a protonmail account.

For each of the kinds of jobs you want. And see how many responses you get with various kinds of education. Consider the years and cost.

Also look into a professional engineering license. With mechanical or electrical you can do that. And get paid to bestow blessings upon others work.

One play is to aim to be a sinecure for a content of unchanging knowledge and be able to develop deep knowledge of the topic such that there is a high barrier to competition. And that knowledge would be relevant to those around you.

Knew someone who opened a shop selling food near a bus stop to students. Those students would spend lots of time and money and eventually get out and make a salary. The food store owner was making a lot more than they would.

Maybe read rich dad poor Dad. Think about your financial situation, what really makes you money. Or is it learning because it's just awesome.

Electrical is
Make circuits, learn analysis optimizations, learn optimizing math (Laplace transforms) abstract that whole thing into linear analysis, then digital signal processing. Communication math.

Or power engineering, move away from civilization to where power is generated, and your kids live by nobody.
Or make an electrical company performing electrical work.

And then you can make filters or control waveforms and transmit them.

Another thing to think about is if the company owns all the machinery used for innovation, if so there is less you control.

There's also Thermodynamics, and biotech. Interesting topics for personal reading

Think of it in terms of trading a specific thing with a specific person or group of people.

Such as - hey just made this new software, do you want to try it?

Hey just made this new circuit, want to try it?

Hey just made this new mechanism, want to try it?

Which one are people most likely to give you personally the most money for?

There's also solar. There are lots of bits, you can obtain all your energy for your house. The guy would pipe heat from the attic out through the dryer for example.

All these capabilities allow you to save time, or control your environment to save time or impress people.

Consider though what will you spend the time you have saved upon?

And know that your youth is the most valuable time, as you have the most opportunity.

If you want money, go with CS. I have worked with phds in electrical engineering and while they made maybe 100-120, they would be in the 300k range if they were in software. I am in software with no cs degree and I still do quite well.