I consider holding Bitcoin to be more like saving than investing.

With that said, HODLers maintain a price floor that enables more innovators and businesses to build out the network and create things built on top of Bitcoin that improve the world.

Bitcoin itself improves the world in so many ways - including how it changes the game and enables vastly more off grid power generation.

If you want a book to better understand Bitcoin, the need, and how it benefits the world - check out The Price of Tomorrow, Check Your Financial Privilege, The Bitcoin Standard, and The Fiat Standard.