The gist is that there are existing indigenous stewardship organizations (that is, organizations wholly operated by an indigenous nation) whose purpose is to develop and maintain their nation’s lands the same way they did for all the time before colonists came and fucked shit up. If you own land, you can give that land to the stewards. The land is then added to the nation, rather than being an explicit part of the colonist project (i.e., the land is no longer “owned” or part of the “land market”). Generally, the previous “owner” of the land is allowed to continue living on and working that land in accordance with the nation’s laws, with a particular focus on preserving the land and maintaining the harmony of the local ecosystem. There’s paperwork involved, and I’m not personally versed in the process, but the link dump below has some useful resources about what stewardship means, how to give your land back, and some of the nations that participate in this process.

Link dump:

https://www.fws.gov/nativeamerican/pdf/tek-indigenous.pdf

https://www.firstnations.org/projects/mapping-ecological-stewardship-opportunities-meso/

https://resourcegeneration.org/land-reparations-indigenous-solidarity-action-guide/