How do i make so the player stays in his and doesn't change his team even if he died?

Hello! I'm new for scripting teams and I'm making my tycoon with no kits or help from the toolbox. But I ran into a problem Where you can change teams even if you are in one so Please help. The script:

local sL = script.Parent
local claimed = false
sL.Touched:Connect(function(hit)
    if game.Players:FindFirstChild(hit.Parent.Name)and claimed == false then
        claimed = true
        local player = game.Players:FindFirstChild(hit.Parent.Name)
        player.Neutral = false
        player.Team = game.Teams.Blue
        if not player.Team.Blue then

        end
    end

end)