I am against a “Rey nobody” edit; it would undermine her trilogy-spanning arc of overcoming her subconscious and irrational core belief that she is inherently worthless.
The whole point of Rey being Palpatine’s granddaughter is to reinforce her subconscious, irrational core belief that she is worthless, she becomes convinced that her lineage is the reason she is falling to the dark side and committing sins like unleashing Force lightning onto the transport and stabbing Kylo Ren in the chest with the very lightsaber he used to kill Han.
After she was abandoned by her parents, she subconsciously developed this irrational core belief that she is worthless, she subconsciously hates herself (she doesn’t actively hate herself, it’s a subconscious thing), she believes this lie that the only way to feel happy, to feel loved is if she gains love and worth from others as well as if she pleases others which would then result in said others giving her the love and worth she desires to make her feel happy; it is for this very reason she frees BB-8 from Teedo, why she bypasses the compressor on the Falcon, and why she tells Luke that she would not fail him in the way Kylo Ren did. She is essentially one who leeches off of others to give her the love and worth she wants.
After Rey gives into the dark side and mortally wounds Kylo Ren, as I stated, she becomes convinced that her lineage is the reason she is falling to the dark side, so she exiles herself because if she falls to the dark side she’ll make things worse for others instead of pleasing them, she’ll never get the love and worth she wants. She thinks that being Palpatine’s granddaughter inherently makes her even more worthless… that is, until Luke shows up and gives her a pep talk that just because she is Palpatine’s granddaughter doesn’t mean she is inherently worthless (for example, Leia knew of her lineage and yet still trained her regardless of her lineage, because she saw the spark or whatever in her).
She heads to the Sith Citadel on Exegol (the Citadel represents the subconscious and hidden part of her mind) to confront Palpatine and end the Sith for good, but he convinces her to kill him so she would become Empress and have control over his forces who are endangering her loved ones, her found family, if she refuses her loved ones, her found family, would be killed off; she accepts, knowing that if she becomes Empress and prevents the Final Order from killing her loved ones, her found family, she would obtain that worth for as long as she lives her life as Empress. Suddenly, Ben Solo, the one person whom she has had a close connection to through the Force for a long time, comes backs for her, showing her that he truly cared about her, that she is valuable, regardless of whether she becomes Empress or not; this allows her to refuse the ritual and stand against Palpatine. However, he then drains most of her and Ben’s dyad life energy (symbolic of how low self-esteem drains one of life and happiness) and gets rid of the one person who has showed Rey that she is valuable, leaving her all alone once more in the darkness; that is… until she calls out to the Jedi of the past, then all of them respond and convince her that she isn’t alone, that she is capable of rising, etc. This convinces her to refuse the lie she believed her entire life, that she is worthless, that she can only feel worth something if others give her their love, so she finally faces against Palpatine. He spits at her about how she is nothing and how she is unable to stand against him; she ignores his remarks and responds back with her own, self-made sense of self-worth and self-esteem… that “she… is all the Jedi.” She permanently destroys Palpatine, the personification of this irrational core belief, once and for all.
And people are still misreading her arc in TLJ, it isn’t about her being nobody, it isn’t about her “finding some purpose in this story,” it was never designed to disprove this “notion” that Force-sensitivity isn’t genetic (which was always the case in the films, most Jedi and Sith were nobodies FFS); it is about Rey accepting the fact that the belonging she seeks will never be her parents and she learns to stop caring about them because of what they did to her.
Rey wants to feel loved by her parents, she refuses to accept the truth that they think she is worthless, that nobody is there to care for her.
There is a reason why Rey spent all of her years, waiting for them to come back. She has been lying to herself that she has some grand destiny which is why her parents left her, showing that they love her and care for her, that she is worth something, but however… she wants to know what that destiny exactly is. She has been lying to herself that if she had learned what her destiny was via finding out who her parents were, she would feel loved, since in this hypothetical scenario they abandoned her for an important reason, showing how much they care for her. But they don’t.
When Kylo Ren gaslights her, she finally learns to stop living this lie, to accept the truth that they weren’t significant people who had a reason to leave her, but rather insignificant people who didn’t have an important reason for leaving her behind, that they didn’t care about her nor love her. The truth that they hated her. That she is worthless.
The “place in this story,” itself, never really mattered to Rey. She only intended to use it as a way to justify her parents abandoning her so she’d feel loved. So she’d belong to them, similar to how Woody wants to belong to Andy in the Toy Story films. The reason she says to Luke that she “needs someone to show her, her place in all of this” is that she wants to find her importance only for the sole purpose of using it to justify her parents abandoning her, feeding the lie that they cared about her and believed that she was worth something so that lie would never die off, so she’d feel loved.
But Rey is wrong. That’s the point. Her arc in TLJ is about accepting that the belonging she seeks will never be her parents or Luke Skywalker.