You are not the only one who is trading like this, I don't know can we call this way of long term investment as trading. For me trading is constantly buying and selling, there patience when you wait couple days before you make a move, but investing and waiting for years before selling I don't see as trading.
My trading strategy is ordinary, when I see good news about some coins I research it, and if I see that a is a good thing I'm buying.
Now I hold my bitcoins and I do not plan to sell any time soon, I think price will rise more, so I have more time for some alts now, they are down and its good opportunity to buy some.