Exercise. Seriously exercise, not just 30min/day. Exhaust yourself.
As for happiness, help the less fortunate, be it humans or other animals, or even plants.
There's nothing in this life that brings more "true" happiness than that.
When you see a bunch of kids at an orphanage getting sweets/smartphones/bikes or a single pregnant young woman getting a flat after being homeless, you'll get it.
You likely won't see this because I'm banned for saying uncomfortable things, but here it is, the secret to happiness.
If doing real change in this world by directly affecting other living things and changing their lives won't help you feel better, then comparing your own cushy life to theirs will.
And if neither works, you can just stop because you're already dead. Get some good medication and hope that works long term.
Also, don't just think local. The world is huge.