Life code cracked?

In my very limited and humble opinion, and through my personal experiences and observations, I have come to the conclusion that life is generally based on two aspects which are past and present Karma which inturn determine the level of purity of the heart and nature.The creater has pretty much set the human life code on auto mode. The karmic residue of the previous life determines the impact on our current life. If an individual has expiated most of his wrongdoings in the past life, he has less baggage of it to handle in the current which also leaves him or her with a cleaner heart in the current life. The percentage of effect in the current of the past depends on the level of expiation in the past life. Every human being is going to do wrong and right in his life. The ratio determines the karmic expiation required and in turn determines the residual effect on the next life. This in my openion explains  the death of an innocent child and sometimes an untimely death of a good soul could also be due to early expiation and saving that being from the trauma to follow since the heart is so pure.I am sure the billion dollar question in your mind is what can we do to change this? In my opinion we are born with a basic nature which has different levels of purity or impurity. If the vices of jealousy or bitterness or greed are very predominant in us then we have more impurities than purity. In that case we have to work much harder on ourselves and we have to fight our basic nature to cleanse ourselves and our heart and mind to expiate our negative karma.This would definitely reduce the residual effect. If we are born with a clean heart, we should go by our own gut and instict in our decision making and try and avoid getting influenced by others. If we are fortunate to have almost completely expiated our negative karma in our current life, we might be born with a neutral situation of a neutral heart and a completely new life with no previous baggage. The more we do for others unconditionally, the more we expiate our negative karma. So the key in all situations of life is putting others before us and doing things for people unconditionally which is believe me tougher than it sounds but atleast we must try.I have always noticed that when we are over calculative and try to be oversmart and try to influence every situation to suit us and our desires, we more often than not land up on the losing side of things. Sometimes when we are stupidly innocent, we gain more than we can imagine. The key is to do and care unconditionally and try not to harm anyone intentionally. In a world where wrong is the new right, humanity is carrying more and more baggage into the next life and this can only be changed by us and our mentality!!!Look at the intelligence of the creator, we are never aware of our past life karma and that is the catch!!! Again implementing things despite the knowledge is such a challenge for mankind if they do not suit us and so whenever you are completely convinced and a 100% sure of your actions, the billion dollar question is " are they really working in your favour?