Is there any way to improve his ping other than LAN cable (since I'm already using one)
live in Austria and when I play Fortnite I have a public ping of 60 …
Which is not very good now.
If only you are connected to the Wi-Fi and the ping is still 60, I would want to get some better Wi-Fi. Or call your Wi-Fi provider and ask at night. That's how I would do it.