Which is correct and why?
Through your help I became a better person.
With your help I became a better person.
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Both of those are possibilities, but "with your help" is more common and more idiomatic.
I view "through" as making a stronger statement. It suggests to me that the help is the primary reason that you were able to be a better person. "With" doesn't come off quite as strong, but it's more idiomatic, which is possibly why "through" sticks out as stronger.