If I am given a chance to go back to 2020 I would hold my ETH very tight and never let go, when covid was hitting the world at its best I thought it over and I sold 24 ETH which I bought at 120$ each, I never knew I was so damn lucky to buy at that price, learn to hold tight if you believe in a project, there are countless of projects in past years that are way bigger in value right now.
My luck was as bad as you dude, I also sold the Ethereum coins I owned about a year ago when the price of one coin of Ethereum was at that time I thought +$ 1000, I regretted the hasty decision I made to sell. I wish I could go back to the past to undo this decision like you, but now I have learned this harsh lesson that promising coins that have many uses are the ones that should be held into the future without ever selling them, and if you make a good profit from them, you should get back your own capital and hold the rest.