Based on the example questions, it feels to me like this proposal is currently trying to cover two topics that may have some overlapping users, but aren't that natural to lump together.
- Mood management and the science of happiness. This is a legit scientific topic, with a ton of real data and knowledge related to how one can manage stress levels and approach situations in different ways to improve outlook, mood, etc, but it doesn't address DSM-V psychiatric disorders, including depression.
- Clinical depression (MDD), or other mental pathology. While it's reasonable to think that people suffering from mood disorders may tend to also be students of mood management, the underlying problem in these illnesses is less like an extreme form of sadness than it is like a medical disease that presents symptoms consistent with extreme sadness.
My concern is this - the way you manage "not getting into a prolonged funk" is fundamentally different from the way you treat clinical depression, bipolar disorder, etc.
As a result, a site that is mostly about "normal" mood management isn't a great place to handle clinical depression, because what you'll be constantly dealing with is two situations that sound very similar, but want for fundamentally different approaches.
It seems like the core of the topic is on how to keep a healthy brain in shape, how to stay happy, and how to manage sadness. But how to treat a medical condition like clinical depression, despite seeming so fundamentally mood-related, just seems to require a completely different knowledge and expert base.
There are advantages - and, let's be honest: some very real pitfalls - to both of these, but in order to address them you must first pick one to focus your efforts on and decide what you want this site to be about.