Sorry if I sound suspicious, but 7 mph sounds like a very slow pace. I might hit (or even fall below it) that if I included the work day between my two commutes -- but that's not really riding time. So the first thing to do is either to pick up your pace, or limit your stopped time during your rides. Want to sit and watch a river or lake for a hour? Or do you enjoy sit-down meals at the midpoint of your ride? Either accept you're spending more time "riding," or don't count it as riding and count the time as spending time outdoors or dining.

My "base" is commuting -- about an hour and a half and 20 miles per day. If you don't want to commute, try to get out and ride (or ride inside) for a similar period most days. With that base of around 3,500-4,000 miles, add in a 50 mile ride (most) weekends, for another 2,500 miles. Throw in a bicycling vacation or two, for 350-400 miles per week, and a few longer rides like a century, and you can make up that extra 1,000 miles in a year's time. If you get out and ride 50 miles every Saturday morning, you can meet your significant other for a late lunch and spend the rest of the day with them.