Good day, mates.
My strategy is to buy coins when the price drops sharply.
Sometimes I fail, because the price drops more than I expected.
But, to prevent this worse situation, I put 30% of my budget at the time of initial investment.
If the price getting down again, I put 30% more.
With this strategy, I am getting some money so far.
In conclusion, I recommend you guys to buy coins when they drops rapidly.
After sharp drop, there should be sharp rising.

I do buy when the coin really have potential or sometime already did pumped a 100% increase. If you see a good pattern then give it a try since there is already a guide when to trade. A proper utilization of price charts can give you a good look on your future profit. There are still promising altcoins that are still sleeping and maybe one day you'll realize that it is just a sleeping giant.