That's what we have to do but it cannot be predicted while market is fluctuating too much. After the action ended, it's easy to consider it by using results yet we need to do this before the action happen.
If I feel it will be dumped hard, I sell. Otherwise, I just hold it.
I never recommend selling bitcoin because in near future we will be getting chances to "use" bitcoin. In my country I have many options to spend bitcoin for my day-to-day life by requirements. I believe this will be the situation for any country in near future.
Please don't understand me wrongly, I meant that I always hold my bitcoin, but I can only sell some of them in case of feeling a hard pump will happen in the market. Hope it's more clear than my first post.