Mine is simple and the best. Buy low, wait, sell high.

For extra I do day trading when there is panic making the price swing up and down.
Don't force yourself to trade that much, take some distance from time to time.
my strategy is same, and i have to say that this is very good strategy, because when you buy for cheap and you sell for expensive only you will get profit only without losing money
and i also use some rules for trading like to never sell bitcoins when price drops, when everyone panics, because price will rise up again we just have to wait for correct moment to sell