If they want to solve it:
1. They need to employ (and therefore train) mental health professionals on a far greater scale than are available today. This will cost money and take time. As matters stand, it is very, very hard to get proper care from a consultant. I had to really press my GP as I did not want to spend the rest of my life sat on a chair watching TV. The 'system' is quite happy for you to do exactly that as you are no danger to yourself or others. (Obviously, if you are a mad axeman they intervene more promptly.)
2. They need to fund a proper academic study into the factors in modern life that are increasing mental illness. BTW, I guarantee they will not like the results. Nor will many people in the community. The pressure of life these days is infinitely stronger than it was even 30 years ago, and no one will tell me otherwise. To give but one example, when people are spending half their wage on rent, it leaves them in a semi-permanent financial crisis. There are no easy answers, by the way. You would need a comprehensive review of how our society works, and it would be painful, controversial and expensive.