For investing in cryptocurrencies. Patience is indeed very important. I feel that the premise here is that the project you choose must have potential. It's worth your patience. Otherwise it won't be worth your time. 
Also along with the patience, we need a bit of luck also. I know people who were stuck at high prices in jan 2018 and they had to wait almost 4 years before the price reached again at the same level. Not many people had so much patience to wait 4 years.