It would be cool if the entire focus of Pavi’s story was reconnecting to past avatars.
Imagine Pavi must unlock the full power of the Avatar state if she wants to stand a chance against her greatest adversary, and to do so, she must go on a journey throughout the world to heritage sites of past avatars in order to spiritually reconnect with them. We get lots of Wan-style arcs where we explore the stories of several past avatars from Pavi’s perspective after she connects with them, including many we have never heard of. The overarching theme of the whole show is learning from history to prevent repeating terrible mistakes in the future. And thus, Pavi is eventually able to prevent calamity, or restore balance to a post-calamitous world, through what she learned, by truly combining the knowledge of her endless past lives.
Now, it’s been a while since I watched Korra, and I’m not a lore expert or anything, so maybe this isn’t possible with what we currently know, but I think anything is possible if they wanted to write it. I think this would be a super cool theme, since it would be about fixing the problem Korra left her (losing connection to all past avatars), and it would be a great reason to have a long journey + lots of philosophical perspectives and lessons.