How can you encourage bluebirds to nest again?

To encourage bluebirds to nest again, provide suitable nesting sites by installing bluebird boxes in open areas with a mix of trees and low shrubs. Ensure the boxes are placed at least 100-150 feet apart to minimize competition. Regularly clean and maintain the boxes to keep them free of pests and debris. Additionally, create a habitat with native plants that attract insects, which serve as food for both adult bluebirds and their young.