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Your best bet at this point is to find a garage door weatherstrip ramp that is long and high enough to seal with the door or add a rubber bumper to the door that makes contact. Remember the bumper won't be the width of the door or you'll end up with a bigger gap, and at that point you're just that guy who always keeps his garage door slightly https://1921681001.id/ open so his wife doesn't yell at him for smoking a joint in the garage. There's companies that make both designs.