When does the prestige ranking come to an end?

[neon cloak]

for all class?

[inland dune]

You can get infinite prestige for any class but lvl 9 is the last one where you get rewards for it as of right now

[final oriole]

I suggest going to 12, that seems to be where they might stop, two rows of rewards seems like it’ll be the max, three might be a bit much

[dusty mist]

Thing is there's a few where they only offer the borders and maybe in the future there'll be more or somehow more prestige would have benefits, but yeah so far no P9 is the max with benefits