What do I use instead of FireServer()?

FireServer() can only be called from the client, so what do I use if the server is calling the remote event? Here's a chunk of the code :

while true do--the game loop
wait(1)
local ShowGui = game.ReplicatedStorage.OpenGui--the remote event
ShowGui:FireServer()--fire the remote event(but what goes here instead?)

If I didn't explain it well enough, the script that is inside the workspace is trying to fire a remote event but it doesn't fir because it's the server trying to call it rather than a client. What do I use instead of FireServer() that the server can use? Other server script(in SSS) :

local ShowGui = game:GetService("ReplicatedStorage").OpenGui
ShowGui.OnClientEvent:Connect(function(player)
for _,plr in pairs(game.Players:GetPlayers()) do

game.ServerStorage.GUI.Regen:Clone().Parent = plr.PlayerGui
    
	end
end)