Books about happiness/being content for cynics and people who are tired of the world

Hello!

Does anyone know if there any books about how to live a happier/freer life, about focusing on moving forward and living a good life, for someone who is very cynical and holds a lot of anger at the world (because of past experiences)? Perhaps a good recommendation for someone who is stuck in a cycle of anger/sadness/ect?

And maybe something whose prose aren't overly "preachy", as it's for someone born and raised with a very traditionally slavic mindset.

I'm utterly lost!

Thank you!