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If your cousin is a resident of Germany, he might sign a formal VerpflichtungserklΓ€rung (a promise to reimburse the German state for any costs if you overstay). That will help. Otherwise, it might do more bad than good.
Germany wants to let genuine tourists in and to keep illegal immigrants out. Most genuine tourists have clear finances and stable jobs to return to. Clarity of where the money comes from is just as important as the amount.