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.
There's no genie and there's no such thing as a time machine, what happened to you happens to every investor not only Cryptocurrency investors, there's no room for regret in investing, true investors always move forward and always look for new opportunities.
There's endless potential and possibility in the Cryptocurrency market forget your losses and just look for those opportunities there's no use crying in spilled milk.