That's not too difficult to research which projects are still running in this bear market, there are actually many old projects but new projects are full of risks. Indeed, I agree that when the market is bullish, some altcoins can find other new ATH, especially well known Altcoin that can last a long time too. Long term hold are better but you are right, as an investor better find projects carefully, many altcoin will not pump when market recovers.
There are still lots of them. The tokens that didn't die in 2018 are still pumping during the 2021 bull market. They didn't surpassed the ATH but yep they are still in the market. I rarely see an update of it but there are still shillers of those tokens.
I really wish I knew in advance that a project can be a good project from the start like Decentraland (MANA) when its price was still 0.01USD in 2017, I could have bought a lot of it. MANA I think will be fine after this bear market.