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The reason Rin is doing so well is because she's:
1. Witty.
2. Creative.
3. Has an autistic, jaded personality that works as a classic "british" straight man humor that doesn't exist elsewhere in the vtuber world.
4. She's seemingly impervious to schizos given her personality.
That's on top of her doing very well in the YouTube algo.
She didn't let the sudden explosion in popularity get to her head, and instead kept on continuing what she usually does to ride on the wave of her popularity.
Basically, she's good at what she does.
BTW I'm not even a Rincel, I just recognize how she's good at streaming.