People are creatures of habit. Real change is only possible when they learn to break the cycle. For some, it's taking care of their health, others prefer therapy, while others still find their peace in meditation, self-expression, connections, or nature.
I know it sounds trite when just looking at these words on a screen, but when put into practice these new habits do tend to make a difference in people's lives. It's why they keep getting recommended.
Different things are going to work for different people and different situations. It can be quite frustrating when you haven't found what works for you, but it really all boils down to hijacking your own brain and taking it back from these doldrums.
Dopamine is the neurochemical responsible for motivation and satisfaction, but it isn't going to randomly flood your brain and make you feel like living. It takes some effort to get the ball rolling, but once you do it really does start to become a positive feedback loop