Despite the fact that HODL is at first glance a very easy strategy, it also has its own difficulties. Not for everyone is suitable. I also had a bad experience using this strategy.
The application of HOLD certainly requires a strategy, it is not as easy as the theory that only buy crypto then HODL until the price is high, then sell and generate profits. The theory is like that but the reality is not as easy as theory, because it requires several supporting factors that not all can or do have.
The first factor is of course capital, because you don't know crypto in HODL when it will go up, of course the money used must be really safe money. Another factor is the ability to analyze the prospect of crypto coins, then must have patience and confidence that crypto will definitely rise. Trust is the most important, because HODL will succeed if it focuses on that trust.
Patient and trust, understanding the potential and building a much better strategy while you are in this system of investment, Holds when you have a good overview of projects that you think that will bring good opportunities, and like what you have said you need to have a good system so while you are in the process of holding you can do it much better when you really trust the coin that you are holding.