I believe the purpose of life is something inherently personal by definition, because even if you profess you had have a divine call and were on a mission, for instance, it's still a personal choice to accept such a religious belief and to align your life according to its precepts, in the first place.

I suspect that it's categorically impossible to find an objective, universal answer to such questions, because as soon as we propose an answer to such questions, the answer will inevitably lead to exact the same kind of questions.

For example, we might feel confused enough about our existence so try to suggest some sentient being who is supposed to have created everything we know and ourselves. But does it really solve the problem? If we can be perfectly satisfied with the answer that there could be an almighty sentient being in the universe, then what made us so confused about more mundane facts - that there exist less powerful and sentient beings in the universe, which are ourselves?

We can try to argue that we don't need further explanation of the existence of such an ultimate source of truth. But if we can accept such an answer, then probably we might as well accept the simpler version, that our own rationality and senses are the ultimate source of all knowledge and values we understand.

And in that case, we can say that the purpose of life is something which we - as an autonomous being with a free will - assign ourselves, according to each person's beliefs and inclinations.