I always keep on buying bitcoin even during the high and low price times. This insures that i get a true cost average on my dollar purchases. I plan on holding my bitcoins long term so this helps me out especially when it comes to tax time with cost basis purchases. I personally think that is the proper way to buy bitcoins. I also still mine them as well.
Well, that is the best idea for doing trading with BTC and also by seeing your comment i have get a point that you have good quality of patience and according to my experience for a success trader patience is must. So keep buying now more and more and as price again increased like up 30k$ then you can start selling at that time.