Which one? In Your Profile? - If You want to Increase It: SS or S all Maps which is still got B or lower (Or not Ranked yet) - If You want to Decrease It: Got B or lower in Any Map You're not ranked yet. *note: I don't know if A will Increasing Your Accuracy, or decreasing It
The accuracy on your profile is only from PP scores. If a score doesn't give you performance points or increase your rank, it won't affect your accuracy at all.
Most of your scores seem to be on the Easy or Normal difficulties. You'll have to get good scores on higher difficulties to have them influence your rank. You could also boost your accuracy by improving the scores listed under "Best Performances" in your profile.