Well, if your self assessment is correct, (possibly get tutored - as power systems seem to be a mature tech subject - what aspect is beyond you - tutor that) another discipline might work. A commenter dismissed your law aspirations - law differs from tech in many ways. There are the LSAT tests that assess the mix of skills/intelligence needed for law. You might pay to sit an LSAT (without any cheating) to get the LSAT assessment - then decide. As for space law, it will be a general overlay of a mix of western countries and (dictatorships like China - might is right) wrangling about it. The field will not be in full flower for ~~40-50 years - about when you retire and will not be a populous field until then? Have you ever taken the SAT tests - a high level IQ test. In my test year I was in the top 1% = engineer, but I lacked discipline for grad school and just became a rich butterfly... now retired at 83, I should have gone to EE instead of CE - as forced by admissions due to low CE entrants.