Neighborhood still doesn’t have DOCCIS 3.1/mid-split/high-split speeds

My neighborhood is still stuck on legacy DOCCIS and there is no option for mid or high split speeds. The highest available speed plan is 1.2gbps down and 40gbps up. This is insane when all around me in every direction has DOCCIS 3.1. With now DOCCIS 4.0 slowly rolling out I would really appreciate some information on why my neighborhood cannot be upgraded.