but through having discipline, the discipline to see, acknowledge and work on things that need fixing, improving or changing,

I really like this framing. When I think of discipline I think of being stoic and unrelenting and putting your long term goals above short term comforts, but you're absolutely right that it's also about doing the hard work to fix things in order to remove hurdles and barriers. That's a really awesome way to think about it.

Men's mental health has clearly worsened over the decades and I think a large part of that is self-inflicted because we've convinced ourselves that getting help is weakness. We have no problem asking a mate to help us move a couch or an accountant to look at our taxes, but getting an expert to help us through trauma isn't cool?

I don't know enough about this stuff, but I'd guess 'Doing nothing, wallowing, being lazy' are symptoms of mental health issues more than the causes of it.