The OP was satisfied with the profits he gained from the coin trade. This is the most important point here. Perhaps he didn't want to be an ultimate winner. In this case, FOMO should be avoided, although it can be psychologically difficult. Every successful trader must remain calm in these situations.
Sometimes I also make blunders by selling my tokens too early or buying stablecoins too late, but I try my best to predict market trends correctly. I even can to take a pause from trading for a couple of weeks, but I never completely rely on technical analysis.
Anyway, most of my funds are in cold wallets, so I trade some of my coins. I gain experience and learn a new financial lesson almost every month.
That's a very difficult thing, it's not easy and it takes time to do that, I personally feel like there is a good chance we may not end up with the "optimum" profit each time, I can't predict the absolute bottom on each bear, and can't predict the absolute peak on each increase as well, it is just not possible and I do not think that it would be possible in the long run neither.
So, what do I do? I buy it when I feel like it is gone down enough, sometimes it goes down even more but that's fine, and sell when I believe it's gone up enough, haven't sold my bitcoins in a long time but I have at least tried it as best as I could when I was trading, surely it did go up some more later on most of the time. It's okay to not make the 100% maximum possible profit each time, as long as you profiting that's fine, important thing is to keep on grinding it.