High packet loss in Fortnite?

I have had the problem for a few days that I get 10-30% packet loss every time I play, which means that my game is also lagging. My FPS are also unstable and go from 144 FPS to 70 FPS every 10 seconds, which bothers me abnormally.

I use btw Wi-Fi.

Do you think it would be useful to use Ethernet?

Sure it uses what Ethernet to use. Packet loss rate only means "packet loss rate". With a Lan cable you have almost no loss, since the signal can no longer scatter