I too am skeptical of myself. I don't always know what is best for me. And, given my track record, I can make some rather boneheaded decisions.
Your post is timely as I have been contemplating my situation. I often ponder, "things could be better. How?"
Today, the answer is to eliminate things that aren't serving me so that I can focus my attention. I'm spread too thin. Next time around, it might be something different. It doesn't always have to be a big change. It could just be a change in attitude that makes all the difference.
Attention is the most valuable resource we have at our disposal - we should use it wisely. Those small changes really do mount up - don't wait to start making them.