If you were given the opportunity go back to past to change your biggest mistake you've made in crypto, what would you change?

Most people make memorable mistakes when they are newbies to crypto, so I would like to hear everybody's biggest mistake that they would change if they were given a last chance

Well, I would definitely go back to 2017 because at that time, I invested my money in 5 different coins because the price of Ethereum seemed expensive to me, so I would sell those 5 coins back and invest all the money in Ethereum, which was $100 at the time. I'd probably sell them all in 2021 and be in a better financial position than I am now