Answer: I'm so sorry about your tree! Resetting it is about the best you can hope to do. Unless the soil is frozen, water it with warm water to try to settle the soil among the roots again. Also add mulch over the root zone, as you suggested. (Do not push it against the trunk or that may encourage rot or other problems.) Next spring and all next growing season through fall, treat the tree as you would a newly planted one by watering it as needed to keep the soil slightly moist. Let's hope for the best.
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