Buy a coin and hold like you intended but take profits when the coin shoot up like double Profit up to 2x and buy back when the coin dumps, crypto is like a circle, there will be pumps and there will be dumps, in that process of taking profits and buying back you will end up wining both ways, whatever happens you won't entirely lose out.
Think about it
That's one way and probably the best way to make money from holding coins, but not everyone can follow the price of the coins they are hodling, and people do not want to trade continuously they are more comfortable hodling their coins and just sell it one-time big time when they hit the price that they want to sell their coin, it could be 5 times or ten times of the profit.