It's possible that the tree is beyond recovery and should be removed. Here is a tool you can use to evaluate that possibility:
https://extension.umd.edu/learn/how-do-you-decide-when-remove-tree

We suggest asking a certified arborist to evaluate the tree's health onsite and recommend a course of action.

Master gardeners are volunteers who do not provide on-site consultation at private homes as it competes with our industry partners.

A great resource for finding a local lawn and landscape professional is the Minnesota Nursery and Landscape Association website: http://www.mnla.biz. You can also find a certified arborist in your area through the International Society of Aboriculture: http://www.isa-arbor.com/findanarborist/arboristsearch.aspx

This information may also be useful if you decide to hire an arborist:

How to hire a professional arborist to help care for your landscape trees
http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/how-to-hire-a-professional-arborist/