Building a Guild in a Fiction World using my Gamer System

Waking up in a fictional world where different movies combined to form a gigantic world of a sort. How would an ordinary guy become the strongest entity? By building a guild, of course. This is a harem novel so before anyone complains, I'll just put it out there. The harem isn't that large and is slow going. Movies include: Marvel, DC, John Wick, Fast and Furious Saga and so on.