Hashem cannot reveal to a person what his purpose is in this temporary physical world. Mostly due to the fact that if a person’s purpose in this world were to be revealed to him/her then either he would do his purpose ASAP so he can accomplish his mission immediately to have the merit of coming up to the true world above and getting to serve Hashem in his holy presence.
Or vice versa if the person would know what his mission is in this temporary physical world then he would delay doing it forever so he can keep staying in this temporary physical world and enjoying all the temporary physical pleasures-which is nothing compared to the real pleasures of the true world above-
May we all look forward to completing our mission in this temporary physical world so we can have the merit and benefit of serving Hashem in the true world above.