How can you be sure your coin will survive the bear market?

After seeing how many coins/tokens rose to top 20 in 2017 only to fall and never rise near their ath ever again, how can you be sure the coin you picked now will be able to survive what ever this market is and when the next bear market comes? Do you just invest in bitcoin and eth until the next halving from now on or do you still explore and find new small cap coins? I’m not sure if I just cut my losses now and play it safe with ETH but risk missing out on gains if the market turns bullish. So far I have 70% ETH 15% ATOM 15% JUNO and you can see how that has gone

This isn’t a rhetorical question, I’m genuinely interested to see why you guys might think your assets will survive and rise in value again and also drop the name of the coin too ;). Also if you are planning to sell or buy small caps