The purpose of creation

But it seems that the whole issue of perfection and self-improvement as the goal of creation was born from an assumption, and not from some revelation that says this is our role.

I don't think so. In principle, it is possible that God does not need or does not want to be trained. After there is a revelation and God assigns us tasks, I ask myself why He needs us. To do it Himself. And the only possible answer to that is the problem of completeness and training.

Regarding the first side of the coin
From the patriarchs and the biblical testimonies about norms before the status of Mount Sinai, it seems that even without revelation, one can know what the role is in the world, right?

Okay, but even without the issue of perfection and completion, there are a number of other possible reasons that come from an assumption that do not require revelation:

In the writings of the Arizal, two general reasons were stated for the creation of the world – “that the fullness of His powers might be revealed,” and “that His greatness might be known.” Or according to what is said in Chabad: God desired to have a dwelling in the underworld. Aren’t these sufficient without revelation?

Eitan,
The Bible clearly and distinctly states the opposite. Every time someone searches for meaning, it begins with a connection with God and His commandments. Adam the First, Abraham, Moses, the people of Israel. When Abraham searches for meaning, it begins with the Creator and His commandments (which preceded the giving of the Torah). These are all revelations.

Oren,
These reasons may be possible (I have no idea where he gets them from), but even if they were true, I would need a revelation to know them. And I would certainly need details on how His powers are revealed or how a dwelling is created for Him in His underwear. What is incumbent upon me.

Take for example what is written in the Rambam:
And what is the path to His love and fear?
When a person observes His great and wonderful works and creations and sees in them His wisdom that has no value and no end, he immediately loves, praises, glorifies, and desires a great desire to know the great name, as David said: My soul thirsts for God, for the living God

That is, it is possible that the Holy One’s purpose in creation is that His creatures will reach His love and fear through contemplation (of creation itself); and all this does not necessarily require revelation, does it?

But that itself needs to be told to me. Otherwise I may love him (or maybe not) but I will not act to love him. Loving God is also a commandment, and not just a natural state or experience.

But there are commandments that can be understood through understanding without revelation. Like what Rabbi Shimon Shkop says about the Torah of Jurisprudence, and his question about why it is necessary to keep what is written in the Torah. In other words, just as there is an understanding that one must keep the commandments of God, there is also an understanding that one must know God by observing His creation.

I will repeat the same argument again: precisely because it is possible to understand it myself, this is certainly not the purpose of creation. This understanding is related to a corrected social structure. The whole idea of the R”ash's jurisprudence is that it is not a religious value but a moral-social value.
I do not know the value of knowing the ’ from observing creation even after there was a revelation. In my opinion, this is an invention of Maimonides. Of course I would not conclude this from an explanation, and I certainly would not conclude that it is my role and this is what corrects the world and fulfills the purposes of God Almighty in creation.