Internet speed

So I have the 1.2gb internet speed and when I run a speed test through my owned Asus AX82U router, I get 800+ mbps. When I run a speed test on my ps5, Xbox or streaming box I barely get 40mbps of download speed. My devices are cabled via cat6e to the router and my modem Arris S33 is also owned and less than a year old. I believe the router is 3 years old. What am I missing here? This wasn’t the case months ago when I last ran a speed test. I’m not too tech familiar but I’ll try to keep up. Thanks