I don't know if this is possible but why not let players keep the items they get and reset the levels. I find it to be a good solution. ( I mainly would like to keep my legendary gear from the iron banner that would effect the gameplay because it is cosmetic)
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Wipe it! Itll be a great feeling when you first turn the FULL game on. Itll be fresh. You'll now have a new player, new mindset and its time to GRIND for that level 8 again.