Taking profits when we should is the absolute hardest part of trading. Try not to be too hard on yourself. Back when I was trading alts I would set thresholds in my mind like 2X, 3X, or sometimes back in the good-old days even 10-20X my original buy-in and then start selling when prices hit those goals. When the market really heated up I'd move the coins to an exchange and set up tiered limit-sells. That always helped to take the emotion out of it. I'm seeing a lot of "influencers" predicting crypto bear/bull cycles are coming to an end and it'll be up only from here, at least for the larger cap coins. I don't believe it though.