Android (bug) is there a way to decrease my hp?

[Allura Price]

so, everyone here already knows about the lvup bug, in my case i keept chosing the same level bonus but this included the lv5 fighter skill wich increase my atk and my hp, but it increased hp everytime i chose it and now i have a huge hp bar and im basicaly immortal and this is borring.
is there a way to modify my save file and decrease my hp to a more normal value?
phone: samsung galaxy j7 prime