Selling everything is not an option because its gonna be profitable soon or layer, this means that you are just throwing away money and that is not smart at all.
I would never sell them all....
You must be doing right with your bitcoins as there are always a lot of possibilities to have better prices for our bitcoin in future. Yes definitely, if there will be some unexpected boom too in prices of bitcoins.
One should just sell small amount to cover the current needs that anyone may face but selling everything must lead to disaster. That is my personal suggestion and warning.