Nothing to add on training side but even if your FTP is pretty static chances are the area under your power curve has improved.
Mine has only gone from just under 200w to 219w (about 10%) in the last 6 months but if I go to intervals.icu I’ve got some graphs showing my average w/kg for various times up to 90mins and the lines are all moving upwards.
If I were you I’d link my data and get the times you’re interested in graphed up. Remember you are not your FTP, there’s plenty of metrics to check.
Ps TrainerRoad folks graphs like this would be brilliant to include on the free space on the career page! Improvement graphs at different intervals [Feature Request]