In this timeline,we need to built Alternate Timelines and PODs for Turkic and Mongol people's building their own civizations in the River valleys on the Steppes they lived first. In OTL,both were nomadic and caused huge rampages in both East and the West affecting Chinese,Iranian,Tocharian And hence Indian and European and Middle Eastern ones. So how would you have them found their own empire with good agriculture and settled empires near the regions they lived where the facilities and resources aren't short of? How would this affect the later Roman,Greek,Iranian,Tocharian,Indian,Middle Eastern history as they don't invade West in the first place and hence leaving the West more or less stable and China/Japan/Korean Civilizations remain more stable as well?