In the philosophical sense, if one is moving towards self realisation, then there is absolutely no purpose may remain in the life.
BG 3.17 - But that person who rejoices only in self and is satisfied with the Self, and is contented only in the Self - for them there is no duty to perform
BG 3.18 - For them there is no purpose here at all with performing action; nor any [purpose] with nonperformance. Moreover, for them there is no dependence on any object to serve any purpose
Not only at macro or micro level but at broader level, the supreme [Brahman] also acts without any purpose. A person becomes indifferent to the results of the action (Karma phala) when acts without purpose. We may call it leela as well.
So in this sense, if you still want to have a purpose, then try to reach at the level of "Indifference". Indifference is opposite of all the things.
"The opposite of love is not hate, it's indifference. The opposite of beauty is not ugliness, it's indifference. The opposite of faith is not heresy, it's indifference. And the opposite of life is not death, but indifference between life and death." -- Elie Wiesel