It has been said that if a modern "average" human were transported back in time, it would be difficult for that person to build anything useful, because of the lack of material manufacturing (c.f. "Toaster from Scratch" and "Primitive Technology" channels) and lack of specific knowledge.
So goes my thought experiment. If I were transported 100,000 years back, I would big-scale industrialize the production of soap blocks and then build soap distribution networks over wast lands (the King of Soap). Soap is quite easy to produce with wood ash.
I would also mass-scale press-print porno comics (using wooden plate carvings).
I think these two what defines civilization and will give me a chance for not being killed as a practitioner of witchcraft.