I’m not going to go too deep into other ways you can earn money with cryptocurrencies because I don’t do them myself. At least not right now. Passive income is great. After you make an initial investment, you mostly sit back and watch the money roll in. It’s like buying a home and renting it out - there will be some maintenance issues but it’s mostly passive income.
Always pay attention to Bitcoin. Most altcoins (every cryptocurrency except Bitcoin) are pegged more closely to Bitcoin than Asian currencies were to the USD during the Asian Financial Crisis. If Bitcoin price pump drastically, altcoins price can go down as people try to exit altcoins to ride the BTC profits; inversely, if Bitcoin prices dump drastically, altcoin prices can go down, too, as people exit altcoins to exchange back into fiat. The best times for altcoin growth appear when Bitcoin shows organic growth or decline, or remains stagnant in price.