All of the above advice plus Strava! chose a couple of segments you like and attack them. It give`s me a little push on my commutes.
As much as some people hate Strava for this reason I love it. There's certain little half a mile, or a mile segments that otherwise I'd just pootle along at the same speed on, but knowing there's a benchmark of my previous best times gives me a massive amount of motivation to tell the legs to shut up and go for it! It also helps limit that 'avg speed depression' post-ride, avg speeds are really never a good indication of anything in my opinion.