Anello del Nebraska (Loop of Nebraska) covers over 1,400+ miles of gravel and paved roads along with some of the amazing rail trails that Nebraska has to offer. The Cowboy Trail, parts of the MoPac Trail, and the Steamboat Trace Trail are on the route. The route covers some very remote areas, so be prepared! The southern sections have very few resupply points, but the views are worth it. There are numerous minimum maintenance roads that can be impassable when wet. Most of the time you can easily reroute if needed. Many of the towns along the route will have motels and there are lots of camping options.
Hopefully you can get out and enjoy this route!
You might want to donate to the Rails to Trails Conservancy, they help build trails across the country.
Locally you can donate to the Great Plains Trail Network (https://www.gptn.org/) or Northwest Nebraska Trails Association (https://www.nwnebraskatrails.com/).
If you live outside of Nebraska, please consider donation to your local trail association.