I just finished re-watching this lecture by Jan Nattier, an academic expert in Mahayhana Buddhism. She mentioned that the 10 Bhumis in the 26th chapter of the Avatamsaka had a predecessor called the Buddavatamasaka which had a more coherent enumeration of 10 Bhumis and had steps that mere mortals could follow.
I can't find it it anywhere. Wikipedia does mention the Daśabhūmika Sūtra, but that appears to be the free standing later version of the 10 Bhumis.
The Cleary translation of the Avataṃsaka Sūtra is the later version of the 10 Bhumis that is mostly opaque literary bombast, describes the results of the steps but not the steps and other than bodhicitta, doesn't describe any steps that mere mortals can engage in in this life.