you start a new game plus on level 1 but you can buy your personas from the compendium at any level they may be.
If you're having trouble with a boss, try fusing a stronger persona. The personas you equip are more important than your level.
As a general rule, if you're able to breeze through the random battles at the top floors of a dungeon, you're more than capable of beating the boss. If you're still having trouble with the random battles, you may want to keep grinding to ease the boss battle.
"Dr. Tenma, according to you, lives are equal. That's why I live today. But you must have realised it by now...the only thing people are equal in is death"---Johann Liebert (MONSTER)
"WAR is a racket. It always has been.
It is possibly the oldest, easily the most profitable, surely the most vicious. It is the only one international in scope. It is the only one in which the profits are reckoned in dollars and the losses in lives"---Maj. Gen. Smedley Butler
