Eden gears or Advanced Eden gears?
Otherwise yeah, you gonna hit a wall in damage around lvl 175-180.
Just keep grinding Illusion Vampire or Frozen if you can't go higher for now.
Xp comes easily here.
As for your RK, get yourself a full Peuz set if you can.
That should help a little with your damage.
It does boost Wind Cutter's damage considerably.
Better ask all that on the discord tho.