Hmm, this is happening to all. I assume only a few people in crypto can say they are not facing this in their crypto life. I also lost the chance during the 2017-2018 bullish market. The thought was the same as you, and hold them for becoming a millionaire lol (kidding). But my bad I was so stupid and lost them all due to the bear market starting.
Yes it's true, usually when someone who is not used to dealing with the cryptocurrency market, I think they will also feel the same way because most of them will definitely be tempted when they have succeeded in earning big income from their first investment and think that they can earn more bigger than what they got at that time if they put all the funds they had back into random coins without looking at the fundamentals and intrinsic value of the coins they wanted to invest so that in the end they had to suffer losses because they were too obsessed with getting rich quick.