In order to create powerful affirmations it's very helpful to discover and dissolve your limiting ones. In a sense, this is a process of unprogramming yourself. Your helpful mind will quickly come up with a list of reasons why this isn't going to happen. It never did before. Some people aren't meant to have money.
Money gets in the way of spirituality.
Another way is to take the situation you want to change, and list the benefits of the negative situation. I'll never have to worry about suddenly losing my fortune. I won't have to feel guilty that others have less. Identify the emotions connected with your beliefs. I strongly recommend the use of flower essences for deeply-held feelings.