I can't tell if you're riding knobby tires or smoother/slick tires. The only thing I would do to the bike is maybe swap the tires for something smoother.

Road wheels/tires (700c) may not even fit on your bike. If you're just commuting on it and it otherwise feels good, I wouldn't bother with the hassle of modifying it or trading it in for a road bike. It's a significant difference, but not THAT big to warrant the hassle.

Besides...26" tires have their own advantages. They absorb bumps and impact better and let you go through more hairy stuff. I swerve around potholes with my 700c road wheels.