waiting's not even the hardest part of investing in the cryptocurrency world, let alone bitcoin. I don't get tired of waiting especially since I time my buys and I don't just hold without a care in the world (not that holding and buying cryptocurrencies now is a bad thing, it's all a matter of preference really.) Waiting for the bull run to arrive is the easiest part of the whole calabash, you don't have to time things, you don't have to wrack your brains out wondering if you've bought enough, you don't need to go back and study shit just to maximize your profit potential. So if you're getting tired of waiting you gotta do something about it, make use of the time you're idly waiting for while bitcoin is gaining momentum.
As you mentioned, it's not difficult to wait for Bitcoin's price to increase because there is nothing to lose while waiting. It's a known fact that, in the end Bitcoin is likely to make a huge profit sooner or later.
I know that it's really hard for some long-term holders to remain patient but those who have already made a huge profits through Bitcoin are typically not perturbed. They knows already that they are not losing anything and they are confident that they will continue to profit in the future.