Did you hit level 30?
Yes I do... that mean that I cannot go futher? no more perks? nothing?
level 30 is the cap. No more perks, exp points, etc.
You can use the console to add/remove perks or specific stats if you dont want to start over again.
http://fallout.wikia.com/wiki/Fallout_3_console_commands#Stats_and_character_manipulation