It's not clear to me what you're asking about. It sounds like your citing average power over the course of rides, but I think that's not directly speakimg to what your really concerned about, namely increasing your ability to produce power.

Ride power averages are extremely variable, depending on terrain, traffic, and other factors, but ultimately gets down to how hard you ride. Are those numbers representative of maximal efforts over the course of the ride?

If yes, then you want to increase your ability to produce and sustain power. That's a matter of training, and measured by functional threshold power. You should probably start there by Googling for FTP; lots of info and plans for increasing it out there. Check out "sweet spot training", too.