It is not possible without having database access.
Max Level is stored in ps_game.exe.
You can only change it by editing Chars-Table
Syntax : /set PLAYER level 80
80 = your max lv. e.g: 70, 60
Max Level is stored in ps_game.exe.
You can only change it by editing Chars-Table
Syntax : /set PLAYER level 80
80 = your max lv. e.g: 70, 60