Doing all the "little" things:
Remembering the purpose of all my runs. If it was an easy recovery day, I did what I needed to let my body recover. If it was a v02 workout, a tempo, or anything really, I would run the prescribed paces as opposed to trying to run them as hard as possible. (Unless of course that is what the workout called for). This let me really really benefit all the systems I was trying to better more optimally. In addition, I started trying to run my runs fast, but SMOOTH. Actively though about making sure I was running as relaxed as possible so I could practice running fast with good form and not burn energy tensing up.
Removing junk food, snacks, and food just for the sake of eating. Even if it only cuts out 100 calories a day, over the course of a few months you lose a few lbs.
Going to bed earlier and getting 8+ hours a night of sleep (recovery).
Mentally just letting myself enjoying the process, and trying to be better than I was yesterday, and not comparing myself to others. Remind yourself it is a process and sometimes you may not see the fruits of your labor for a year. Consistency is key.
And of course, increasing my mileage.