No sell.
My cautionary tale, which isn't unique among newbs and know-nothings, began late 90s, my first foray into stocks during the tech/internet start-up craze. Several guys at work were into it so I joined in, without knowing what I was doing, and became a statistic when the Dot Com bubble popped. Lost some, not too bad, but the experience left an impression.
Held what cash I scraped out of that and began saving in simple CDs before dipping my toe in again with mutual funds around 2003, building up a small portfolio until I saw the 2008 Crash kicking off. Reacted more quickly this time, sold everything, and got out with about $20,000 over what I'd put into it. Whew! The oft repeated lesson, which I had to learn myself the hard way, was seeing that the modest portfolio I sold, recovered nicely in the following 1~2 years. I was working, making good coin at the time, but the take-away lesson was I should have stayed in and gutted it out.
Held that cash, saving in CDs and Money Mkts along the way again, then got back into the market early 2014 with a more substantial amount, this time with a Financial Advisor @ .90% AUM, and put everything on auto-reinvest divs.
During this COVID downturn, I resisted the urge to react, and continued to let it ride on auto-reinvest, taking solace in snapping up more shares at lower prices along the way. 2 years later, things are looking ok again, for now.
At the same time, just before COVID hit, started dabbling with stock positions in a separate brokerage account. When COVID hit, I chanted the old adage to myself, "Buy when there's blood in the streets", bit my lip and began building more. All looking good now. The luckiest among them being Tesla in the $3-$400 range, before the split.