You made a very important point here
Because investing in bitcoin for short term can lead to heart breaking when the price drops.
It is very important to use Money that you will not be using for that time to invest and a leave the coins for long time inorder to maximise profits from your investment.
You may leave your coins like 10-15 years without withdrawing
Don't be in hurry to withdraw even when the bitcoin prices drops
Before those years it must have been added value.