ok question:
how does introducing structure to a group ride work? do you have a set plan going into the ride like "ok, I'm going to put in a hard 5 minute effort in z4-5 and try to get in a breakaway. if someone follows, I'll switch between z3-4." or something? How would something like this differ from just doing 5 minute z4-5 intervals and ftp tests? aren't you tackling the same zones, just in different fashions?
what counts as having a structured schedule? are you basically finding out what needs to be worked on, whether it's the sprint, anaerobic, vo2, threshold, or endurance, and basically making a checklist of the things that needs to be done every week? Because if that's the case, it should be easy to gauge for yourself what needs to be worked on, and what's lacking.