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.
I have the same experience as you during the start of pandemic. I sold all my ethereum for the price of $230 not knowing that it will sky rocket not just doubled the price. But we have nothing to do about the past but to forget and just let it be an experience then keep on moving forward for another good coin to invest then if you can hold, much better. Market is really unpredictable!
Some part of us will really regret about it especially when we see how big the amount we can get if we continue to hold those coins but as said we can revert what happen from the past and let those things a learning experience. We can still say that we are in early phase on crypto and good changes still might happen in future also that means possibly more pumps will came if people don't want such things to happen again they should act accord to how the market moves right now.