User blog comment:Drpf33/Difficulty Modifier, Part 1/@comment-25085701-20191008175640

I might also suggest 'Heroic' for level 6. And there's a way to force change your difficulty modifier using the API, though I haven't tried it since the change -- I swore off cheese for a whole month, and made it hit for 16 HP worth of damage in the first week. :)