The search for a purpose is the search for a meaning. But meaning is something that exists only inside human mind. There are no meaning outside of the mind. Only mind can make meanings and project them into the reality. And unskilled eye can be fooled by such a projection and think about a real object and the meaning of that object like it not two distinct things, but one unified thing. I personally was fooled like this some time ago.
So the tip is: to find purpose of life watch not the life itself, but look at youself, watching the life.
I guess you got to keep looking, keep trying intuitively based on what you know yourself, create a feedback loop from your attempts and when you find your purpose, you will know. Good luck!
So the tip is: to find purpose of life watch not the life itself, but look at youself, watching the life.