HI Azfiddle-
I too tried Wenzel coaching a few years back, at 48 yrs old. It didn't help me much, but I think it really depends on who your coach is.
(I felt as if I wasn't being taken seriously since I wasn't "racing"). Since then, I have made some changes to my Ruby, most importantly
nice wheels, and that made a gigantic difference. Speedplay pedals have again made things even better. As for working on myself, I started seriously
working on my legs, especially my hamstrings, and the results have been very noticeable. Working on technique that I have seen on youtube and learned from
riding books and videos has also helped me improve. For me, coaching just ate in to my weight training and riding time, and didn't really help. FWIW, I am 51.

Good Luck!!