yes I agree that not many altcoins can rise again after a price drop in the market. I've experienced it myself and it's a mistake I made at that time so I've lost a lot of money. so until now I have never bought an altcoin that doesn't have a great future. for now I only collect coins like ethereum and binance, because both of them I think are able to survive and go back up after a price decline on the market exchange.
That mistake of yours is also the mistake of many and that taught us how to become better at picking the next coins that we're going to invest. And it is why you don't pick random altcoins that just pumped and it's always better to see that you're able to research about the coins that you're about to buy. Those that have been dipping but still with potential, they're good coins to buy and you also have to determine the risk that you're taking because if you don't, you're just buying again randomly.