Now that I'm too late to sell at the floor price, is it still worth to let my coins on bittrex ? Is bittrex a good option for the value of my coins?
Keeping your coins at any exchange as cold storing option is not wise at all whether it is Bittrex or any other exchange. Why to let coins there when you are not going to trade with them. You should move them at myetherewallet which gives to access to your private keys to be able to use your funds from anywhere using any compatible wallet later.