Imagine me creating a topic in 2017 asking if doge coin can hit 0.70$ some day the answer would have been NO from almost everyone, what I have learnt from crypto projects is no matter how stupid a coin looks and you need to get out because its not doing fine always leave a bit behind, I sold all my doge coin 120k before 2021 bull market and left only 1067 Doge coin in my wallet, learn from my mistake.
Assuming the reverse was the case would you still feel the same as you feel with regrets now? i think what is most important is doing what you feel is right and don't be too regretful.
The fact is, it is not easy to know the future performance of a certain project, dogecoin was not expected to reach such a price level few years back mainly because of its nature of being a meme coin, many people never see it to be that worthy to hold, but crypto is full of surprises but it is not a reason to jump into any worthless project just because.