Newbie: Planning a Month Long Round The US Trip

I would travel in a smaller area...I went in September on a 30-day highway 66 adventure...started in CA. at Barstow and continued east to northern Arizona, New Mexico, Texas Panhandle, Oklahoma City, and then went south through Oklahoma, into western Texas, through southern New Mexico and Arizona...and ended back in Barstow. There is so much history and exciting things to experience. A coast-to-coast adventure wouldn't let you really experience each area.