My xbox one x isn't getting the upload speed it should.

My xbox one x isn't getting the upload speed it should.
to whom it may concern,

I had preordered the xbox one x when it was first ready to come out. I have been on the xbox insider club since the first xbox one came out. the issue im having with my xbox one x is that my download speed is always good. roughly between 85 to 106 mbps
depending on the day i guess. however my upload speed since day one on this has always been 5 to 8 mbps. i need more than that. Again i have 4 xboxes in the house, 2 are xbox one S wifi one in the basement in a room next to my gaming room where i have mine
hard wired to my xbox one X and another one that has wifi on the 2nd floor of my house in my sons room. the other one hard wired is in the living room. the one in the living room is getting constant 100-16mbps on a ny giving day download speed and upload is
around 15-20. on mine it should be the same. my isp provider ATT in my area Cleveland. i only can get 100mbps and no fiber yet. anyhow not the case the case is why is the upstairs one in the living room receiving the upload speed im supposed. but i cannot.
the router i have is the Asus Gt-AX11000 thought it would speed it up. i personally stream on my pc using the console companion app because of no capture card to use with streamlabs obs. in order to stream using the companion app it says i need a min of at
least 10mbps to use it properly. plz help .desperately need it.

:)