Reset/NG+ command

Hi, I'd like to know how can I do to make a system that when you're level 20 and maxed, you could write a command, which will reset your character to level 1, but with an increased max stat cap.

My problem is on how I can raise this maximum, and how can I give those information like, the number of time I resetted, to the client so it can adapt the "yellow-orange" stat on the client. Thanks if someone can help

so you want a command that resets you to level 1 but your stats say the same and you can only use the command if youre level 20+maxed?
not sure what exactly youre saying because of the way you worded it probably