Just always buy when you see a price dip, when it's very low there is always a correction that will happen and you can even sell at short time
for profit. Everything requires timing but if you are for long term holding, better hold your seat because it's gonna be a long journey. The best thing to do in the market situation is just to hold your coins or stick to short term trading.. I like trading bots like Btc robot or Trade Santa. because they are easy to use and Trade Santa is for free.