One of the best investments one can make is helping others. It is actually an investment that will give dividends for all eternity. This is not trickery; it is just being a good person and showing Hashem that you care about others. The good people of this world who do care about others are the ones that Hashem pays back -- they do not have financial problems.
A small mitzvah could be $10 or $18 to help others. It is not the amount; it is the feeling in your heart that you want to help; that is the mitzvah achieved. Yes, the payback is tremendous, but it is only because you want to do Hashem's will, not because you want reward for the mitzvah.
Go to this webpage and help; Hashem will pay you back in kindness tenfold and it is very effective Teshuvah for this month of Elul.:
The Chesed Fund