Good luck. Do you know your FTP? If not and no power meter, how do you know how hard to go? Good for you for being able to pedal 120.
I'm more in the Eddy Merckx camp: "Ride lots." If one rides say 100-150 miles/week with about 50' of elevation gain/mile, you're a fit cyclist, good enough to do anything you want. I don't ride a MUP unless it's the only way to get from A to B. But then I don't live in a big city, just 100,000 people. In winter I do more intervals on my resistance rollers, almost all aerobic, and more like 100 miles/week total. I never really enjoyed intervals until I got a power meter. I do a lot more of that type of thing now.
An hour/day like you're doing is great. Doing something much longer on the weekends is a very good thing, a totally different experience.
__________________
Results matter