In my opinion the power of positive thinking by itself is greatly overrated. I think that the usefulness of positive thinking is that it helps a person to see more options, set reasonable goals, and make positive choices toward achieving their goals than if they felt trapped, stuck in a run with no options.
I am opposed to the idea that simply thinking positively attracts good outcomes and thinking negatively attracts bad ones à la The Secret. It is so often used this way as an excuse to blame the victim rather than help people who need specific types of help (beyond thinking positively). I know too many women who have resolved to think positively when what they needed was to make good business, money, and relationship decisions, etc. When thinking positively and making no changes doesn’t produce positive results, they simply blame themselves for not thinking positively enough.
The idea that positive thinking alone will attract positive outcomes seems too much like a magical concept to me, and I really don’t believe we should put too much faith in the supernatural fixing our lives for us.
Somewhere in the cycle a person may decide what they need to do is to try harder, even though the strategy they are using is likely one that has only resulted in failure in the past.
So what to do? It is true that positive thinking can lead one to take the steps that lead to success, which leads to success, and inevitably more positive thinking. This would be illustrated as such:

which we obviously prefer to this:

But you can see by looking that there is no starting or end point. What can happen is that any small success will lead directly to more positive thinking, better planning, and successful carrying out of plans, thus, breaking the cycle.

Any point in the cycle is a point where change can occur. And through the use of hypnosis and NLP you can use the power of your subconscious mind to break out of that cycle, to find positive options and success.