With that in mind, the smarter way to hold bitcoin is to sell it when prices start going down, only to re-buy a larger quantity when prices stabilize at a lower range. Then, with the same capital, you increase your bitcoin holding every time prices drop.
The problem is, not all of us here have ability to do that, I mean who can make a decision about when prices have decreased to sell, and when prices have stabilized and can be bought. I used to experience that feeling when I bought BTC at $ 2k8 in 2017 when it went up to $ 4k I sold when it was profitable, but it continued raising to $ 19k in December 2017.
You are certainly right. Unless you make a living out of trading, few people have the time to be on top of all their investments. That is why we are working on automating our trading. It takes time to get a strategy properly described in mathematical terms so that it can be automated, but once it's done, it is mostly autonomous and can do all the trading on its own, just like i would do myself, following the same rules and logic I follow.