Not getting anywhere close to 2000 Mbps on Xfinity Router + Hardwired

Hello, My service is fairly new and I am not getting anywhere near the paid connection (2000 Mbps) speeds using the Xfinity router! I am hardwired by ethernet cable (900 Mbps) and significantly slower on Wifi (600 Mbps) if next to the router and drops quite a bit (below 400 Mbps) you go a bit further for example the next room - I am curious if I am on the wrong plan + why the drastic drop?