Whether the investors want to sell or not, depends on their strategy. But normally when the prices are at a suitable level only then will the investors sell for a better profit margin, not because they are reluctant to sell. The investors will wait for a suitable price, even after a bull run.
I will keep some coins for some more time for I want to get additional profit if there is further increase occurring in price. selling of coins in higher market on high price is the success and even it starts when you are on the way and you cross the 15k dollar price that is the bull run reflecting the clearly. Wise investors apply these rules and strategies for they want to enjoy in the crypto world and these all are necessary here.