Trading is no different than any other serious endeavor in life - preparation is key. Plan your work and work your plan. Nothing 'random' about that. It would be incredibly naive to think that a random approach (like a coin-flip for entry bias, and an equally random timing mechanism for position entry and exit) would yield a consistently positive result. It would work if the market stayed relatively static in terms of net change and rangebound in it's 'random' walk - but it does not. And that is the problem for you.