The world you think of is in your own mind.
True happiness cannot be found in things that change and pass away. Pleasure and pain alternate inexorably. Happiness comes from the Self and can be found in the Self only. Find your real Self and all else will come with it.
You are not in this world. This world is inside you.
To know that you are a prisoner of your mind is the dawn of wisdom.
All you can teach is understanding. The rest comes on its own.
Just be. Let your true nature emerge. Don't disturb your mind with seeking.