Wandering off topic a bit ...
This brings us to the interesting question of what you mean by average. A touring or audax style average, which includes breaks and stops and is a realistic measure for planning, or a Strava style moving average which is a software boosted number designed to flatter the the rider's ego.
Earlier this year I had an interesting 80km ride consisting of a series of flat out dashes, and head down efforts (often in the wrong direction) punctuated by phone call and navigation stops (I was trying to catch up with someone). Amusingly my Garmin awarded me a moving average of 26.5km/h, which is bizarrely high. How effective was I at actually catching up? Not very, my real overall progress was a less impressive 16.5 km/h. I did catch up, eventually, at the lunch stop. But a bit more effective use of brain, and better planning, would have seen me catch up much more quickly and efficiently, at a lower "moving" average speed.
Although real averages aren't confined to audaxers and tourists. I was advised by a gnarly club rider who I respect a lot, someone capable of remarkable feats of high speed endurance that his approach to building overall speed was to forget garmins and such like and work on your time over a set course of varied terrain. His reasoning was that compensating for delays due to other road users, rest stops and so forth were a natural part of the exercise.
But back to the OP. As
@S-Express says, just ride your bike.