Senior Member
Join Date: Aug 2009
Location: Minneapolis
Posts: 5,752
Bikes: 2022 Salsa Beargrease Carbon Deore 11, 2020 Salsa Warbird GRX 600, 2020 Canyon Ultimate CF SLX disc 9.0 Di2, 2020 Catrike Eola, 2016 Masi cxgr, 2011, Felt F3 Ltd, 2010 Trek 2.1, 2009 KHS Flite 220
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From what you describe, you are either immensely talented for a novice 47 y.o.with one year of riding experience or you are exaggerating your average speeds. 21 MPH on solo rides of 30 miles? How do you measure that? Unless you've got a Garmin or equivalent, there is some reason for skepticism.
I'll assume for the moment that your speeds are accurate, in which case, you are going to be a great rider. But 120 miles/week is a pittance. If you really want to be fast and strong:
Aim for more miles/week
Work on your pedaling technique.
Work on your position on the bike - get more aero.
Find a group to ride with that will push your limits.
Lose 15-20 lbs.
And like everybody else says, intervals and hills.