I got an alert from one of my discords on Saturday and thought, oh wow, they must be prepping to write for some reason. And then I realized it was November 1st. One of the things that happens when a large group you participated in cracks to reveal all the people it was harming along the way is a odd disconnect. How could this thing that was great for me have been bad for others? Am I an idiot for not realizing what was happening? Are the accomplishments I had while part of this group tainted?
And those questions often lead people discard the harm. (Witness the former head of NaNo restarting NaNo while putting up a disclaimer that he wasn't there when things got bad so has no idea how it happened and also no apparent reflection on starting a new group with any safeguards to prevent a repeat.)
Writing in community is great. I personally am editing right now because I am so close to done on this story that I can taste it.
If writing in community helped you write, but the community turned out to be flawed, find a new community. If writing in community helped you write, but the community was flawed, you can reflect and learn and listen to try and be more aware. If writing in community helped you write, you are a writer. You did the thing.
If writing in community didn't help you write, well, now you know more about your process. Also true if it did help. Learning about your process is always good.
And if you are writing this month, there are tons of great groups you can join, locally, regionally, online. If communities help you, there are plenty to join.