Never ever stick to one idea, thought or perpective. Evolve as things present themaelves. Sticking yo wrong idea or thought can take away decades of your life from you. If something doesnt work just simply move and try to genrate a new idea, evaluate and even if it doesnt work, move on again.

For most people hapiness comes from external sources. If something unlikely happens they will begin to suffer in their brain while the event had already passed hours or days or even months ago. There is absolutely nothing that you cam change about what happen but you can plan the coming towards you in future. But not to let go of past will make sure that future will be same too. Just by letting go of things hapiness will automatically flow towarsa you.