It's greediness to keep holding your tokens when price is surging, many made the mistake in last bullrun season of 2017 and after February 2018 bears attacked the market dragging every single coins and tokens to its feet, Bear market is always the best time to buy coins and build portfolio and Bull market is the best time to make gains and take profits
Thats why I sold mine way back before when it had its All time high as it will surely fall down because of the selling pressures in the market from the investors who are also taking profits from their investment, was gladly able to buy a lot of btc and eth and some good alts to (more on defi) which makes my bag full, Im looking forward for more investment, having beark market again is indeed a possible one