Check and see if the connections at the battery and the starter as well as the ground wire are clean and tight. You may want to pull the battery cables off and make sure they are clean.
The other thing I suggest is to have your battery load tested if the first checks do not work.

There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!