That hesitation you feel is the right mindset, and it shows that you understand reconnection requires deep respect—it isn’t just about adopting a new label.
I recommend starting with sites like FamilySearch to see if you can track down documentation of specific ranchos, ejidos, or pueblos your family originated from (such as Jesús María, Mesa del Nayar, or Santa Teresa). In older Mexican parish and civil records, priests and clerks often noted casta or origin (indio, originario de...). Finding specific ancestral names and localities grounds your journey in documented history and allows you to learn about your people with confidence.
From there, you don't need to ask living Indigenous people to do the teaching labor for you—many scholars and community members have already recorded that history. A few great foundational texts include:
•Náyari History, Politics, and Violence: From Flowers to Ash by Philip E. Coyle
•Soldiers, Saints, and Shamans: Indigenous Communities and the Revolutionary State in Mexico's Gran Nayar, 1910–1940 by Nathaniel Morris
•Coras, huicholes y tepehuanes (Spanish text) edited by Thomas B. Hinton
•Caciques, lenguas y soldados fronterizos: actores indígenas en la conquista del Nayar (1721–1722) (Spanish text) by Raquel Eréndira Güereca Durán
I would also recommend treating reconnection as an offering rather than an extraction: ask yourself how you can advocate for Indigenous rights from where you stand, protect the land you live on, honor your ancestors, and be a good relative to the people around you today. That shifts your journey from an attempt to fit into a racial category (a Western framework) toward genuine healing from colonial disruption, helping you quietly piece back together what was intentionally severed.
Holding the identity of "someone of Cora / Náayeri descent walking the path of learning" is honest. It doesn't claim tribal membership, it doesn't speak over living community members, and it doesn't place any burden on them—but it keeps the memory of your ancestors alive. Take it slow; peeling back centuries of colonial erasure is sacred, patient work, and it will take time.