I also agree with your opinion that we should invest in altcoins that have been able to survive in bull and bear markets. and these coins have proven that they always experience ups and downs in accordance with market trends. and I agree that we should not exert energy on coins that do not have a solid foundation.
Invest are speculative, there are some of them that has passed through bear market and bull market and perform very well but I can point them out that they have been the worst altcoins to ever get hype in the previous runs. Ripple was consider the best before ethereum and so many people see it going to $10 but XRP has been one of the worst performing altcoin. Look at seller coin too, that one look the most useless coin and one of the oldest coin anyone will want to invest money into, try something good.
There are other altcoins categorized under privacy coins like Dash, Monero and others. These coins were once consider as one of the best coins that has survived the turbulence of the bear and bull market but I want to tell you that investing in privacy coins today is a big financial mistake because the governments of many nations are against the use of privacy coins because they are difficult to traced to thier source of funds, this is why monero is hated the most and then dash because of their encryption.