My router is a TP-Link AC 1200 wireless dual band router.
If you have to have the USB approach and you don’t want one with extra antennas standing up from it, this is the USB WiFi option that directly provides the maximum capability for your computer and router combination.
https://www.amazon.com/TRENDnet-Wireless-Adapter-Supports-TEW-808UBM/dp/B07C2ZKYSD
You will want to log into your router to make sure it’s using all of its frequencies for this adapter, but it might auto configure.
Your N card is stuck on heavily abused lower frequencies and it has no where to move to without interference from neighbors on all sides.
There are power settings that allow Windows 10 to turn off your wireless and/or USB devices. Could also be a driver. It would be tough to show you details on how to fix this via FB. But your best bet is to buy a cheaper laptop (with an HDMI port). There is no real advantage to getting a desktop now unless you are into gaming and need lots of room for a powerful graphics card. Desktops aren’t really cheaper now. The laptop will work find if both monitor and laptop have HDMI connections. Also get an external mouse and keyboard combo (they are cheap) if you don’t like typing on laptop keyboards and hate laptop touch pads ... which I hate.