FTL, fusion, stop aging, holograms, GAI, BCID, cellular regen, brain transfer, space colonies, etc...
I wonder, I know it's not great to look at a movie but in the movie Jobs 2013, there's a moment, where they turn the board on and you see the characters flash across the CRT. I also am aware there were other similar devices at the time eg. alto.
Still that's like a new thing... even from that perspective was impossible to foresee what we have now all the computer-related things that were made.
I think this is the topic of 0 to 1, doing hard things.
I'm still looking for that thing that I genuinely pursue/will relentlessly pursue until it's real.
Holograms exist. Free air animated holograms a la "Obi-Wan Kenobi you're my only hope" are a long long way off. Peppers Ghost is good.
Adding value to things is hard. But, keep trying. These arent good choices, they're all hugely capital intensive or high risk. Pick a field like civil engineering or bio sciences, find people doing work who need data science or programming, or visualisation. Take you skills in, add value. Incremental improvement which is provable is very high value. Even good science to negative outcome, is higher value than "I think I can get fusion in 25 years for $20b of risk money come back me and my home fusor"
Help an archeologist!
Please let's start with what you want to achieve. Make money, become famous, world peace, what?
Most of the things you mention are solutions looking for problems. If that is academic curiosity, do whatever you like.