I overwatered my lime tree and leaves have all curled up and dried out and are all falling off, how can I save this dying tree?

Tree is 5 years old and was producing lots of fruit and doing great now it is dying because of overwatering during the dry season.
Update: I overwatered my lime tree and leaves have all curled up and dried out and are all falling off, how can I save this dying tree? I should mention I'm in a southern climate and this tree is planted in the ground, not in a pot.Thanks in advance for any suggestions.
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