OP, my mileage usually starts lagging this time of the year so perfectly normal and even expected here.It’s just part of the annual rhythm of cycling for me. The spring and summer months were always about training for events and participating in them. The events stopped in early fall so riding the fall was around social rides and just chilling. That rhythm seems to carry on even though I’m not riding in as many events.
I probably would have quit riding if it were about sustained efforts 12 months a year.
The most important thing for me related to cycling is to make sure I’m enjoying riding. When I stop enjoying it I ride a lot less. It also helps me to have some variety. It would be pretty boring to me to ride similar routes all the time. It also helps to ride different bikes and switch up from road to gravel or greenways.
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Ride your Ride!!