Being a specialist isn't enough. You along - no matter how good you are - are not enough. Either you need to control enough money that you can hire many specialist (Elon Musk with SpaceX), or you need to convince someone with money that is the right path. The skills for each of these are people skills not technical. Either way you will spend all your time in management activities so technical skills are not worth learning (beyond enough to understand what is feasible).
If you want to focus on technical skills, then you need to find a specialty that someone with good management skills will think important so that you can work with many other experts to develop things.