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 cant stay for long without checking out the whats happening with the Blockchain and the price of Bitcoin at the moment. I do invest money when price drops sharply, but not all the times, I only do when my mind tells me this is the right time.
When I buy in, the price will slowly get back up to a higher and then start dropping again but slowly this time; this is when I sell out and then wait for it to go down to the main lowest it will be for that year.