Not read all the responses so sure had lot of good info already but 2 things from me:
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Firstly in your calender there are a lot of big drops down to near zero. Consistency is key, for me if I take this year as an example I had a 2 week family holiday where I did v little (BUT did do 2 short runs a week to keep some fitness ticking over). Other than that I trained every week (Not always flat out, stuff like Xmas I do a lighter recovery type week). If sick then obviously rest but otherwise keep the consistancy and the training habit.
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Secondly I would suggest more V02 stuff. Your training plans all seem to be focussed on sustained power which SHOULD be aimed at raising ftp…but if not working then maybe you respond better to V02 stuff. Plus this would help with the surges on group rides and give good bang for your buck to raise ftp as well. I’d swap sustained power build for general (or even short) power build. Then maybe crit or rolling road race speciality- mix it up. At end of day if not happy with results from current training then try another approach - so hit the shorter harder stuff. Hurts like heck but gets results!
However first and most important thing is to do a ramp test and REALLY push yourself to set accurate training zones. Should be gasping and slumping over bars/collapsed in heap at end push yourself!