That's kind of the problem with crypto as a whole... there's not always an idea of its inherent value. Back when BTC was at $30 and then dropped to $3, I freaked out and sold when it got close to $30 again. It doesn't take a mathematician to know how bad of an idea that was given current knowledge, but being worried about volatility and potential drops just doesn't go well with crypto.
If you are serious about investing in crypto, it's important to have entrance and exit points and stick to them. Yeah there's a lot of "woulda coulda shoulda" that goes on, but that is all hindsight being 20/20. How many projects have hit impressive ATHs only to never return and/or flame out? Quite a few, especially among pump n' dump scams.
Anyone who (for example) bought BTC at $1 and sold for $30 might feel the fool now, but in reality, a 30x gain is NOT a bad thing. Just like anyone who got into Ethereum at $1 or even $12 back when it first started picking up steam in 2016. If you sold during the 2017/2018 bull run you might feel the idiot now, but at the same time, if your gains were 30x, 40x, 50x, or higher, were you really foolish to sell? Nah. Those kind of returns are ridiculous by most standards.
If you're playing "vulture capitalist" and buying up crippled assets during/after a crash, you may set a price target of 10x or 20x the crash value and HODL, only to feel like an idiot for selling out too soon. Or you could just lose everything as the asset continues to devalue itself and delists. But why risk HODLing forever? There's just no guarantee that a particular token that is successful once or twice during bull markets will go up in perpetuity.