Individual time trial all day. Or show up at the designated time, introduce yourself to others, find someone to ride with and agree on the rules of the ride. Then, off you go.
You are simply racing against the clock. Not other people. Challenge yourself as you repeat this loop & observe improvements. It is a great way to end the work week.
Join Event on Strava to let others know you will be there. This will consolidate all responses in one visible place: https://www.strava.com/clubs/155/group_events/749172
Route segment available to measure your own progress: