Anything at all involving space anything, and AI knowledge. You habe the world ahead of you and lots of time to be an expert in a sheltered setting (ie: high school aged youth with hopefully no serious life responsibilities like working to cover bills).

Space, rockets, related tech to provide those rockets with stuff... it's going to blow up. Another wierd thing is space mining - no joke. There are asterpids that some companies with private capital investments looking at how to land on them, mine the minerals which don't exist on earth anywhere, and bring them home. This will be lucrative.

Also, anything associated to making living and development easier in a world with more demand on building resources. For example, there is a looming sand shortage. Sand? Yes, sand. It is used the world over in cement/concrete and glass. This will bump costs up and push others out.

I hope your brain is swimming in ideas. Engineering is an exciting field with limitless potential.