Honestly, if Bitcoin grows to the heights it aims to, it's not too late. You have to take note that there will only ever be 21 million ever mined, and that some are lost permanently daily -- if demand remains consistent or grows, then economics dictate that each piece will become even more valuable. It also has to be said that people are only just starting to recognize Bitcoin as legitimate, meaning you still have a hell of a head start against the general populace.

Either way, one other thing you can try is buying low and selling high. It can be tricky to identify when to buy and sell, but it can pay off pretty well. Bitcoin dipped to below ~$5k just two months ago, and if you had bought then, then you'd have nearly doubled your money by now. People often meme about Bitcoin going on a fire sale whenever it dips, but they're almost always on the mark in hindsight.