I dont know if anyone already found out this method but thank to saveeditor of idlehand88, a really great thank to his holly hard work on his editor, I found a way to over run the limited NG+ of this game.
every time we play the NG+ playthrough to the last boss, use his editor to uncheck the NG+ option and your game will recognize your save as first playthrough with max lvl 22 (lvl cap of first playthough) but all you can keep every thing from your stat to your equipped equipment lvl 30 lol (unless you unequip them, the game will let you use lvl 30 item with your lvl 22 Death :))
about the stat from the stones and relics award, remember not to use them so much or the game will crash!
again, thank idlehand88 for your editor
I post this for anyone who hate the limited NG+ of this game can enjoy over and over the Death you love!
remember to hit thank button to Idlehand88 for his awesome work!