If that's true, it's just a sign that the market is becoming more and more irrational, just like during the ICO craze, investors are throwing their money at literally every coin, hoping that a chance for 5000% growth would compensate their losses. BTC goes up -> major alts go up -> small alts go up
When BTC will enter bear market, all these alts will crash to their lowest lows, so if you plan to speculate on them, don't get attached to them, don't be greedy - just take profit and be happy with it, don't become a believer in "good project", you'll just lose almost all your investment.
I think that if the market is becoming more and more irrational as you have said, then it is all the more we need to be very careful in our dealings with our trades and what to invest. Sure these previous coins and tokens are going up again but that doesn't mean you go all- in on them. If you are smart enough then you know that it is a big no no to go back and invest on coins with dubious past or with very little or no performance at all. I would stick to the top alts, if I were you.