I just finished a game with Monty on Prince, but I found the Eagle Warrior -> District Spamming synergy worked really well. I got a worker out of every single unit from another Civ. I DOWed everybody I met (Phillip, Tomyris, aaaaand crap who else. I forget now but there was a third) and sent a stream of workers back home to quickly finish off districts, I couldn't grow my cities fast enough to get enough districts out. I was going for domination but ended up winning a culture victory way earlier with only 82 tourists. But, again ... Prince level.