My trust in Bitcoin grew exponentially when I knew the price history of Bitcoin.
Besides other things, history is one main thing used in technical analysis. You can't analyze a market if you don't know the history of that market. History helps you determine how that market behaves at different points in time.
Bitcoin price history is necessary for all Bitcoiners, but to be a successful holder you have to understand the price history of Bitcoin.
This will help you understand the volatility of Bitcoin.
When you know the price history of Bitcoin you will understand that there is nothing new about the fall and rise of price. Also, the history will let you know that the price always goes back up after a fall and that should help you in your effort to hold Bitcoin.
When you read about the price history you'll see years like 2017 where Bitcoin peaked at just over $19000 from a thousand dollars. The volatility of Bitcoin goes both ways and you can only hold on to your Bitcoin when you know these things.
This is a graph of Bitcoin price in 2014 by
Statmuse 
In 2014, Bitcoin went from about a thousand dollars to under $200 and finally ended the year at just over $300. This kind of knowledge helps you keep the faith as a Bitcoin holder when the price dips.