Lawn Re-Wilding
Lawn Re-Wilding is the idea of replacing synthetic lawn care methods with "holistic" methods with the goal of a more "natural state" that attracts pollinators and other keystone species (that would help regulate traditional lawn pests), allowning the micro-ecosystem of your lawn to thrive as nature intended. This could mean replacing your Kentucky Bluegrass with a variety of native cultivars that thrive with minimal care, reducing or elimating mowing, and all-in-all save you time and money in the long term.
Xeriscaping
Xeriscaping is a landscaping technique that reduces or eliminates the need for irrigation through the use of drought tolerant plants and other materials. It's a sustainable gardening method that's popular in dry regions but can be applied to other areas as well. As climate change continues to warm the globe, alternatives to traditional, resource-intensive lawns such as xeriscaping will become more popular.
Non-Chemical Solutions
If the idea of surrendering the mainenance of your lawn closer to the care of mother nature doesn't yet feel right for you, there are other ways of maintaining your lawn that don't involve chemicals. Adding in organic matter like horse fertilizer and prioritizing soil health to native cultivars will allow the grass to be much less susceptible to disease and environmental stress.
Agriculture and Food Forests
Lawns can easily be planted with fruiting bushes and tress which produce food for the home as well as promoting biodiversity in your area. Fruiting trees and bushes provide food and habitat for insects and birds which are key to a fully-functioning ecosystem. Bugs are the backbone of any food web and by introducing fruiting plants both you and your environment win. It is not a costly practice and can be done using only organic and holistic practices. It also can be sectioned off so you can still have a chunk of grass for recreation and aesthetics.