Congratulations Randy! That's an impressive drop in times over the years. Interesting to see the mileage and times over the past five years.
You sound like you've got your running goals established for the next couple of years, steady progression seems to work well for you.
So, what are you going to do about that voice in your head telling you to quit? You've been training your body, maybe it's time to start training your mind. It's tough enough to run a marathon without negative thoughts clouding your brain.