You should work hard on your real life as well. Crypto income shouldn't choose your main income for feeding your family. Obviously earning crypto-currency would be your good passive income, but you shouldn't depend on it. Once you have a good job and have some funds then you might start trading, lending etc and you might sell your development experience if you have. You might also earn by signature campaign but you need to build your account. But, please don't try to find quick rich methods, you might lose your funds.