How do you fix a door jam without replacing the door

when we bought our house, we noticed the door coming from the garage was kinda warped, but didn't pay much attention until this year. After looking closely at it, we realized it's been "kicked in" probably several times. The plate where the door latches won't stay tight. I have 4" screws in it but it still comes loose. How can we fix the door without replacing the door and frame

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