Emps wasn't doing a lot prior to the Age of Strife, he'd begun preparing against Chaos due to that one event where a warp rift showed up in new york and a dude with a Chainsword beat the shit out of Belkar- which somehow resolved itself, but was taking it's time.
Then the Age of strife hit, and everything he was working towards long term got fucked, Ebay went down, the Internet died, all of his internet accounts went defunct, then Tzeentch, during this Period turned Bill gates into Nyralathotep and permanently made Technology unsuable.
So Emps using his powers had to do everything manually in the crudest means possible. Reunification, Primarchs, the works- everything from there on out was an uphill battle that got Mankind, despite having better teach to livable standards of 1900's Britain at least- and again, this is the work of a Shut-in who was probably Diogenes, so he only had to work with tidbits from the cultures he actually influenced/took a part of, but ti's clear given his Holier than thou attitude, the last time he ever took up a direct position of leadership was when He accidentally made the Jews a thing.
Jesus may have been an Early Sensei- makes sense in retrospect- and Genghis Khan, Oda Nobunaga and that one other guy is now a Greater Daemon of Khorne so some bizaare shit went down in China no doubt- I.E Emps in a Dynasty warriors game.
Again, though, he was the backup plan for stopping the ship of mankind from sinking, was overworked, and was also, a massive social retard- he did his best for mankind, and gave them a chance at not fucking themselves over.
Despite maybe setting them up to get fucked in at least four ways than one by unintentionally allowing Tzeentch to get rid of the Malal- who would be able to push the reset button on the Warp to the Realm of souls by it's very nature, securing this it's own version of an Imperial Truth, the Primordial Truth, which worships it's other brethren as a unit, thus omitting Malal.