The decision to either sell or hold your tokens depends on many factors. The major factor is the preference of the token holder. What seems a huge profit to one, may seem a small amount to another. Assess yourself and ask, "If i sell the tokens, do i make enough profit for myself?' If yes, then you are good to sell and vice versa. If holder thinks the coin has great potentials to rise in the near future and can wait, then it becomes another good strategy to hold.