I learnt self-made millionaires adopt a common habit ie they don't invest in a single source of income but rather diversify their portfolio.Personally,my investment is in3 major portfolio.Bitcoin,real estate and real business. However, I hold onto my bitcoin and exchange to fiat whenever its best to sell in order to make a decent profit.
Thats good, you have to diversify your investment. As we always repeat " Do not put your eggs in one basket". Also, its good to have an MsI or multiple source of income since employment alone is not enough nowadays unless you have a higher position in a company.You can spread your investment to paper assets or stocks,bonds and other guarantees,traditional buy and sell business,trading,bitcoin, doing the stuff you like and sell,doing some services,and so on.