I think everyone including OP already knows that it takes physical training, time and effort to get faster. So inferentially, some common questions that he may be looking for:
Will road-specific equipment other than what he describes be appreciably faster?
Sure.
Is the speed he has now decent given his bike and how he describes his routes?
I'd say yes, that's nothing to be ashamed of, and if you need that validated just fire up Strava and make a long segment out of some of your usual routes.
Is it feasible for him to get significantly faster by training?
Again, skipping all the "it depends" stuff, there's no reason why he couldn't expect to gain several mph in average speed on the same equipment, same routes, by putting in a year of training.