Better hold it as long as you can. Selling coins while it's low is such a waste since it will only lead you to losses and regrets. You should know what coins you are investing in cause most of the coins get pumped after few months or after the full project got executed. Every will have it's own time to shine.
Newbies should fully understand the market before investing here, panicking will result to you a big loss.
The market is volatile and if your emotion is weak, most probably you will hold your holdings at a loss.
Be more patient, and don't be scared about the market right now, it will up again in the right time.