For 7 days you will try to only think positive thoughts. Whatever happens to you will see the good side of it and what positive things you can learn and take away from it. By the end of the week you will have started to discover the very real benefits of a positive thinking, how much negative thoughts there are both in you and the world (you might be surprised) and begun establishing a new habit to replace your old, less constructive one. And then you can continue from there.
What I suggesting here is not a mindless kind of positive thinking where you pretend everything is ok whilst the house is actually on fire. Instead it’s you noticing a situation or stimuli and then choosing a positive and useful response to it instead of reacting in a knee-jerk way.
It´s you focusing on what could be a more positive and useful solution for you. Or even better, what could be a win-win situation if the situation involves other people (which many important situations in our lives do). A win-win solution is more often an even more satisfying and beneficial solution than the one where only you win.