Script doesnt work anymore after character reset

[41HWB (HWBUSH)]

while true do
	wait()
	local partsInRegion = workspace:FindPartsInRegion3(region, nil, 1000)
	for i, part in pairs(partsInRegion) do
		if part.Parent:FindFirstChild("Humanoid") ~= nil then
			local char = part.Parent
			char.Humanoid:TakeDamage(char.Humanoid.MaxHealth)
		end
	end
end

im using a different way to create a variable for the character as im working with region3, however i cant use CharacterAdded:Wait() so i was wondering how do i make this script work again if a player resets?

local char = part.Parent

[41HWB (HWBUSH)]

nvm fixed it thanks to this post

local playerService = game:GetService("Players")

local part = script.Parent
local pos1 = part.Position - (part.Size / 2)
local pos2 = part.Position + (part.Size / 2)

local region = Region3.new(pos1, pos2)

while true do
	wait()
	local partsInRegion = workspace:FindPartsInRegion3(region, nil, 1000)
	for i, part in pairs(partsInRegion) do
		if part.Parent:FindFirstChild("Humanoid") ~= nil then
			local char = part.Parent
			local playerFromCharacter = playerService:GetPlayerFromCharacter(char)
			local char = playerFromCharacter.Character or playerFromCharacter.CharacterAdded:Wait()
			char.Humanoid:TakeDamage(char.Humanoid.MaxHealth)
		end
	end
end