Whether these answers are helpful to people will depend on if they have particular mental health issues.
In my case, the most commonly recommended actions - exercise and meditation - trigger my health anxiety and OCD. Courses of CBT (cognitive/behavioral therapy and ERP (exposure and response prevention) have been much more productive.
Which is to say, we're all working on our own difficulty levels, and if the basic maintenance isn't working for you, don't hesitate to reach out to the specialists!