I feel some times that I missed the bitcoin bus. The year 2013 and 2017 was like the height of the bitcoin cashout. I doubt we are going to have that period ever again. So much progress has been made from then till now in terms of education and awareness and the number od bitcoin adopters have more than doubled. What I can think of right now as a way to retire early with a huge stash to build something that runs on bitcoin - like a payment gateway or just something huge and valuable to the community.