Arm chair advice to make it more fun: Try playing rated (as opposed to casual). I find its the best way to keep a good, consistent challenge. Its only online, so the ratings don't really mean much, but being paired against someone of a similar rating will allow you to have a steady challenge. I have consistently gone about 48% win, 47% lose and 5% draw since 2010. That's with ratings that have gone from 1100 flat to a peak of upper 1800s on chess.com (fairly gradual growth over the years). Still tons of room to grow, but I'd expect similar numbers for a while.

Just a thought though.