Keep calm and hold your portfolio, if you have chosen to believe for example in Steem then hold it, just because it drops to 1$ it does not mean the project is over what so ever, if you once bought a crypto because you had solid reasons then you should stick with it and overcome the fear of bubbles.
Do not let euphoria or fear affect your investments. I am not an expert in the subject but I do know that it can be so easy to sell after a coin drops over 20% of its value. Keep cool.