Your idea is good but in my case I would always choose to invest in bitcoin rather than putting my money in mutual aid fund or stocks. Actually, that was my first idea before when I have still a little knowledge about bitcoin, but now that I have matured, I was able to analyze that investing in bitcoin has more benefits.
Both of them are good to invest with. Mutual funds, stock markets and bitcoin can give you a good interest if you are going long term. You can invest on all of them. It is actually better if you put your money on different investment accounts to minimize your risk.