You already do a LOT of riding. You could perhaps improve by reducing quantity and increasing quality. It’s quite likely you do a lot of mid paced riding? Think of a couple of very hard high quality interval sessions a week instead together with longer base level rides which will help you aerobic fitness and give you riding to do when your legs can barely turn because of the intervals you did earlier in the week.
IMHO using Strava to time rides isn’t a help as when training you should be measuring time and effort – speed doesn’t matter at all. As an example if you’re doing a base ride (say Zone 2) then you are probably going to have to pedal against your brakes when going downhills to maintain your heart rate in Zone 2.
Then again I’m mid pack after 3 years riding (only 1 racing though) so who am I to talk.