Buy or develop your own time machine and go back to 2008 and mine BTC on the computer at your mothers house in the basement
If you want to become rich then you will need to work hard and only focus on working and working that is how you become successful.
People who are rich these days all worked hard and did not think about the money.
you would most probably need to work hard for that but you might just invest into bitcoins right now and wait for the big price growth
You cannot depend only on bitcoin to get rich as you can't afford to put all your money in a single investment as if bitcoin disappears in future then you will loose all your money.
Depends on your capability and your interest because it was already proven that we can be rich with bitcoin just like what happened to the early adopters, there are many ways to earn money here and I have found my place where I am comfortable working and investing at the same time and that is only in the crypto world.
Well, they are lucky they are already rich now and maybe some of them are already putting there business in real world. It is true that it depend on our interest and passion because when we pursue our dream to be rich we should do things that we are good to give us a greater chance of achieving our goal, if we are good in trading then that would be good.