When you are trying to earn cash from the job alone, it's not going to be much of sustainable. In that case investments of various types always help. Crypto is one source that can make you comfortable with the earning. So here I have written an article on this topic, do give it a read :) Check out the article: https://read.cash/@esmeesmith/how-to-earn-extra-cash-using-crypto-9d501e14