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.
Stop thinking that, you're not an investor if you have never experienced selling at the wrong time or not holding a coin that turns to 100x profit we all have a share of that experience, there are no investors who made a profit from all the coins he invested, even the best investors who have good average in analyzing have fallen to what you've gone through.
We are going in a circle price drops to recover again, you're lucky if you have funds to allocate at the time that the market is in a huge drop, besides selling coins at the wrong time, not having funds to allocate when the right time to buy and opportunity is there is another regret of investors.
For me bigger regret is not having money to buy... I got into crypto iin 2017 and was without money to invest that time. Advice just keep researching and investing it's still early for crypto in general.