your dream is just a dream, i prefer work hard now to get 21 btc from 0.1 btc.
and how are you going to do this? investing? gambling?
i do not consider that work, building from your btc is risky, it is not really work as it is not guaranteed.
he simply work in RL job, and convert a portion to bitcoin, is that simple, a medium wage can already earn you more than 1 btc per months
even with a part-time you can reach 0.5 btc right now, you are still in time to buy a few
at this rate reaching 21, would mean 21 months with a regular job, which is too much, he need something else, to speed up the process