I think I should be at a dozen or two of millibitcoins

. Still a long run, but I don't lose faith

!
That's fine starts bro. I wish and hoping you have huge amount of Bitcoin. Bitcoin is the place you choose your passive income to earn with slight effort.
If bitcoin is a passive income for you then its hard to become rich with it as your income will be limited and you can expect to become rich with it only if you have good capital and if you are full time in it.
Getting rich with bitcoin is not an easy thing, someone with a lot of resources or some big source of income may can achieve that, like someone with a casino or an exchange website, or someone with great trading skills with a good capital.
Regular people can also just save money and invest those savings after some time.
Those rich people also had to start somewhere, if they didn't inherit all their money at least...
Just remember that saving comes before investing, there's no point in investing small amounts.
Saving should be our first priority as it will allow you to reach to a certain capital over a period of time and once you have managed to save good money you can go for investment after that.