Keep focused...my mind wanders and I forget my surroundings eventually leading to one of those "wow, just missed that hole in the road" moments.
Also, I always felt learning, understanding, and practicing countersteering was invaluable for me as I switched from dirt riding to roads many years ago. Saved my butt numerous times when i "wasn't focused" and approached turns much faster than my capabilities.
Keeping a large "buffer zone" around me is another thought flowing through my mind whilst riding. Tailgating at high speeds doesn't seem to wise.