I'm sorry to see you're going through this! chapter 3 has been facing a lot of outside problems, and I was hoping it had finally subsided. It's good to hear that it's getting finished, however. Hopefully that will increase back your subscriptions!
I see some people in the comments are noticing the issues on their end, so making your post is certainly having an effect. Though I'm not sure if subscribestar can really help, as just turning back on the billing on all subs could have consequences for them. With some luck, you can try to make them send a notification of sorts to the users, at least!
anyhoo, wish you the best