For me if the market turn to red must better if you hold your bitcoin that you already have becaude if you sell that your money gone. The best you do also is to buy more bitcoin and spread the good news of bitcoin to know other so we can see again the price pump. Don't be panic if the price decrease just relax and do your best to stay calm and positive the bitcoin community.
Holding is the key if were too afraid to take risk on trading or doing buybacks. We can wait and clear some in our wallets that we knew weren't suppose to be there still.
yes, maybe it all depends on the situation. we know when a coin has potential, when the market turns red, I think we will continue to hold it. well, I also hold a few coins right now, since bitcoin prices dropped from $ 10k a few months ago.