alright,
Calc updated with the timeframe, now gunshy id tell you to leave whatever CRT you are doing and make one of why the God tier scale to this physically, with any wank scaling you can think of, we gotta get ready for the death battle!
but now seriously, if trying to remediate with the calc being too high, first looking at it: its affects places all around the world, but its not every corner, so thats why we use one nation (like japan) as if it did affect all of it, and its still overtime, so we divide using Japan with timeframe
but another thing, specifically the feat refers to causing landslides, which leads to devastation that makes all countries poorer, Falling Devil doesnt neccesarily needs to lift the entirety of Japan (or actually the entirety of some places of the world), and with entirety, i refer to the whole elevation from sea level of those parts around the world, Japan for example has 438 meters of elevation from sea level, this is 438 meters of materials like Rock (some countries are over 1000 meters of elevation), above sea level
feat could refer to for example lifting all the trees of a forest/most buildings of a city, which are dozens up to hundreds or more below than lifting the whole elevation from sea level of that area
idk how could i do that, if theres some data of for example weights of certain cities/forest (only the buildings, forest, and other structures) maybe its possible, sounds like a more viable way to calc it