How to optimise training this winter

I mostly ride on my own, with a group ride occasionally. My garmin says I’m overreaching and apparently have 4 days recovery from the last ride… But inevitably my recovery times speeds up and I expect I’ll be recovered by Wednesday evening.

My last FTP was 225, which is about 2.9W/kg. My last ride, I had a nominal power of 190W over 3hr20 which doesn’t seem to really warrant 4 days of recovery + overreaching (aerobic and anaerobic). As pointed out above, average HR of 150 on this ride.