If everyone was as optimistic as you are about bitcoin in the long term, then its price volatility would be very low. But the truth is, everyone has different plans about investing and trading bitcoin and why they buy bitcoin. Without volatility, bitcoin is stablecoin, but because bitcoin is decentralized asset, everyone can trade it freely without control.
People are always different in thinking about bitcoin sometimes with a lot of people panicking it can cause the price of bitcoin to go down and people like that are not always optimistic about their belief in bitcoin they will never think of this as a long term investment because of uncertain certainty even though I am myself too still believe in bitcoin with high volatility but when the price is still low it is an opportunity to continue to buy as the best opportunity.
It's just that everyone should consider this volatility as something natural for assets that are freely traded 24 hours every days. Fluctuations will allow anyone to gain as well as cause them to lose, but due to the high demand for bitcoin and their scarcity, the price will only get higher in the long term.
Sometimes there are also those who don't understand the volatility that should be taken for granted, some of them still think that assets with high volatility are dangerous and it's clear that their beliefs are not fully optimistic about bitcoin, let alone with fluctuations that can occur at any time.
The supply of bitcoins will not increase and decrease while the demand for this should continue to increase considering the limitations of this asset so it is very possible that bitcoin will be more valuable in the long term then I will do it for HODL.