Hi @EKnaack
Based on my experience and the previous year’s Black Friday & Cyber Monday (BCFM) campaigns.
Running a cyber-Monday campaign 14 days before yields 25-40% more sales for us than 4-7 days for subscription-based brands.
The most important thing to consider is to segment your audience first for Cyber Monday:
- Existing customers
- New customers entirely
- Customers who have lower tier subscriptions to market them upgrades & add on
- Customers you lost recently (churn)
- Visitors
It will help you to market the right subscription campaigns to the right target segment.
Just make sure discount coupons are working properly and trackable.
Hire some influencer a week before if you are into B2C (highest ROI during BFCM)
Good luck with the BFCM campaign 
Thank you for the mention @kvlschaefer again 
Best wishes,
from Berlin