Really, though, that's like saying you wished you had bought Beanie Babies, MtG cards, or even tulips before the Dutch mania. Bitcoin isn't an investment vehicle, it's a cypherpunk Pog, and its value is completely dependent on the behavior of other collectors. There was no logical reason to believe btc would get within an order of magnitude of its current value, and no reason to think it'll be there ten years from now, absent some institutional shift to its use beyond treating it as a curiosity (which would require a degree of liquidity that I don't believe currently exists).
Some people got very lucky -- which is great! But don't lament that you didn't do something that, at the time and without the benefit of hindsight, wasn't really rational.