How can I refresh the whole player and not just the character?

Is there a way of refreshing the entire player so that all of their GUIs are deleted except for the default ones?

Maybe this will work

local Players = game:GetService("Players")

for i, gui in pairs(Players:GetDescendants()) do
	if gui:IsA("ScreenGui") and not gui.Name == "Chat" and not gui.Name == "FreeCam" and not gui.Name == "BubbleChat" then
		gui:Destroy()
	end
end

Set you GUIs so they Don't rest on spawn, Apart form the ones you want left on.

You could do something like

game.StarerGui.YOURGUI.Restonspawn = false

Then you could kill the player to rest or try the load character thing

player:LoadCharacter()

More on that here https://developer.roblox.com/en-us/api-reference/function/Player/LoadCharacter