It is asked so much but there is only answer for me: hodl! you can do something else as well but the best way to survive is hodling. Sometimes even hodling may not be useful, you must lose everything to come back stronger sometimes 
A lot of market research is needed, gather all possible information, indicators of the price status in the market, fundamentals, behavior of investors in the market trading, and always remember that market is Volatile, anything can happened at any given time, the key is Patient and Hold on to your coin when the market price is on the down stream, market will recover after the market glitz, we should also take note the volume of investment by the investors during the trading market.