I sell as an when required as i am dependent on bitcoin income for my family expenses, only 20% maximum i keep for long term investment balance i convert it to fiat currency as and when i require or when i think that the price is high and do small trading and get profit.
Its hard when you are 100% depending on bitcoin with your living. I do sell also when there's a need but most of the time I hold. And when the price is low I wont sell it anyway because I regret seeing the price of bitcoin at low. But when there is really no choice, I force myself to sell if theres a need.