In the cryptocurrency world, you always need to invest your spare money. Investment means putting a part of your remaining money into something and letting it make money. If you put it all in, it is not an investment but gambling. Currently, the 100% way to make money in the cryptocurrency world is to buy Bitcoin or Ethereum in a bear market, hold it for 2 years, and sell it in a bull market. Other methods will not necessarily make money, and random contracts will eventually return to zero.