toooo sour

Greeting all,
I have been lurking on here for a while and now I need your expert advise.
I began a starter in Feb. of this year. We live in rural South Dakota 50 miles down a dirt road to the nearest little town so the homemade bread was a great relief on the fuel bill plus the fact my wife and I really love the homemade breads.
I babied and cared for this starter like it was one of my kin. Early on this starter performed great, then I could not get much of a rise and we worked through all that.