How would I regen a character? Not respawn but regen.

local Sand = game.Workspace:WaitForChild("Sand")
local Debounce = false
 Sand.Touched:Connect(function(hit)
    if hit.Parent:FindFirstChild("Humanoid") then
    if Debounce == false then Debounce = true
         game.ReplicatedStorage.GravityController:Destroy()
         print("Module successfully destroyed")
    	end
    end
end)

if game.ReplicatedStorage.GravityController:Destroy() then
	workspace:FindFirstChild("Humanoid")  -- this is where I want to regen the character
end

Check this out: https://developer.roblox.com/en-us/api-reference/function/Player/LoadCharacter

It essentially just re-creates the player model.

If this is a direct answer to your question make this an accepted answer.