Honestly, there is no secret ingredient to that. It all boils down to the level of patience one has in general. If you tend to be a very patient person, someone who never complains, is always okay to wait for something to happen no matter how much time it takes, never in a hurry, then you will most probably have no issues with buying and holding your Bitcoins for as long as it can take because as you said, it has already been some time but we are yet to see a sign for the bull run except for the expectation that it will happen soon since the halving event is next year.

However, if you are someone who either has no patience or has a level for it, you will most probably get fed up with waiting and will most definitely start feeling tired after a certain point because you just feel like you are getting anxious and you aren't being able to wait anymore even though you know there is nothing that you can do except accepting the losses if you take a reckless decision.