The 2017 bull run was based on hype that was why shitcoins were able to give more profit because they were cheaper and people bought it based on the huge hype in the market then
But the next bull will be quite different from that and it will be based on real life usage and adoption so any project or altcoin that doesn't offer real usage or solve a problem will beat the dust.
Without a massive influx of investments in altcoins, there will be no bull wound. The influx of investments can provide new investors who can come to the crypto market, including under the influence of hype or because of the collapse of other markets. Also, investments in altcoins are possible if there is an outflow of money from Bitcoin.