You need to start by checking the battery terminals for corrosion. A bad connection will create too much resistance. Also check your fuses; there are some in the cabin under the dash, and some in the engine compartment. Check your owners manual. You can also check if there is a good ground to the engine block from the battery.
It could be the starter. easiest way to find out is to remove it and take it to a parts store where they can bench test it. I would go ahead and take the battery with, and have it tested as well.
Good luck!
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