Do you mean as a crypto investor, they should have multiple source of income and not just rely on their investment in bitcoin? As a crypto trader, you can always trade the market base on the result of your analysis of the market. You don’t have to wait for the market to be on uptrend or downtrend before you can execute a trade. If you’re an experienced trader, you need to just analyse the market to enter a buy or a sell base on the direction of the market. Only a novice trader will be bothered of this because they won’t really understand the market and might enter a trade wrongly. Multiple source of income is for those that depends on trading for their income and can also do without them when the circumstance does not favour them at that time.
If they are a crypto investor, they will search for many potential coins for their investment. They will start to invest for the project that looks promising to gives them the profit. They will not just have one investment type but they will spreads their investment in many coins that can increase. They will be careful choosing the coins because many coins can not increases for a long time so they will be careful to select the coins and research that before they decides.
As a trader, they will try to learn many lessons about trading and practice so they can improve their skills which can helps them to analyze the market. They will also search for the other sources of income because they know that can gives them more money and more knowledge so they can increase their income.