Well, from the beginning if you are not doing well with a structure set up in such a way that it will not succeed, there is no way you could push yourself too much and expect things to work when the foundation is wrong. Don't kill yourself in such and rather look for a better alternative.We should always know the point when to give up. Sometimes been persistent makes you lose all. A revaluation of strategy and consistency is key to development. Work on stable strategy and be consistent with implementation.