Guys... what is the best way to Lv up now?(please)

[Ryans]

Actually the exp you get at the end isn't decided by RNG the game will give you more end reward exp if you're doing a much lower level dungeon, I would assume this is because the monsters give less exp than the higher level one , I would love if the primals were removed from the low level duty roulette for this reason, it is a very fast way to get 100k exp as a chunk but you miss out a lot of monster exp :/

This.

They tried to make the bonus from doing a low level roulette close to the experience you would get from running a dungeon at your level by queuing for it manually. It's their way of making leveling in dungeons faster by not having everyone queued for a specific dungeon and no one getting groups.

Oh and as far as I know they didn't nerf fate experience. They just enhanced dungeon experience to make it equal to or better than fate experience.