The mistakes people make is because they are investing in altcoins, could you believe that altcoins are more volatile but many of them do not make it to all-time-high in 2020/2021
of no doubt there's high volatility in altcoins, the risk is high as well than the profit it gives, whenever the bitcoin price falls, the higher they can rise the higher they fall, some of them never recover from such loss because they fell to an extent of not recovering, people often refer altcoins as shitcoins because of this heart breaking occurrence of one day life another day death, but few among them maintain the stay but no guarantee that they can play the role and steadfastness of bitcoin, it's better to stay safe with bitcoin than rotating round about altcurrencies.
If an holder bought at high price, they may not want to wait again and sell in losses after coins like bitcoin has already reached all-tim-high. Some people that invested at low price can gain but altcoins are more risky.
since bitcoin is the king of cryptocurrency, anyone interested to invest should at least start with bitcoin, gather momentum and experience for two years or more, understand how to speculate price and buying techniques because giving altcoin an attempt, but because most people wanted to treat altcoins as ponzi where they can amass wealth within a short time they got stuck along the way, that's why bitcoin set the pace for other cryptocurrencies, buy bitcoin when dip and sell when high, but this doesn't actually work with many altcoins that way.
I am predicting the next bitcoin all-time-high to reach over $100k.
it is possible but we have to get close to 2024 halving or right immediately after the halving, a new ATH will definitely set in, those that have invested during dip will have lot reasons to smile.