You can use one out of these
Many Native American tribes maintain their reservations and tribal economy through a variety of means, including:
Natural Resource Management: Many tribes have natural resources on their land, such as timber, minerals, and water rights. Tribes may manage these resources through their own departments, or they may enter into agreements with outside companies to extract and sell the resources.
Agriculture: Some tribes have established agricultural enterprises, such as farming and ranching, to provide food and other products for their members and to sell to outside markets.
Cultural Tourism: Many tribes have developed cultural tourism programs that allow visitors to learn about their history and traditions through museums, cultural centers, and other attractions.
Federal and State Grants: Tribes may receive federal and state grants for a variety of purposes, such as education, health care, and economic development.