Usually people earn more on cryptocurrency when cryptocurrency market rise.
But when cryptocurrency market falls people lose their interest to digital assets and sell their cryptocurrency.
There are many ways to earn crypto not only in the form of trading and investing but you can also earn a crypto in the forum by joining bounties, airdrops and signature campaigns. We also have gambling, staking and others where you can earn more cryptos no matter what is the status of the market, rise or not.
Not all will lose interest once the market falls because they know that fall in the price was only temporary but they will just wait for the market to recover again. Those who easily lose interest are likely new in this market and have invested in scam projects and maybe they have lost many times, so for them, that is enough to quit.