My last recommendation would be for a specific maintenance schedule. When looking at the retention overview, a pattern could be seen. On weekdays, the new users are generally more active from Monday to Friday, but on the weekends, there are significant dips that lead me to believe that weekend maintenance would be more effective and better for users, rather than during weekday traffic, when interruptions occur. Existing users fall under a similar instance, as their lowest user counts occur on the weekends.
