Nighthawk WiFi 6 Mesh System and Metronet Fiber internet

I just switched from Mediacom cable internet to Metronet Fiber internet.  I have good download speeds, but the upload speed is only at 0.07mbps.  If I switch back to Mediacom, the upload and download speeds are above what I am paying for.  Can anyone help me out with this?

My router is the Nighthawk WiFi 6 mesh system (MK63)

The ONT is connected straight to the Internet port on the router.  I have tested with wifi and wired and get the same result.  (If I connect the PC directly to the ONT, I get close to 500 up and down.)

In my searching for possible solutions, I have seen that with Orbi's and Verizon Fios, you have to set the Orbi up as an Access Point.  Anyone know if this will be the same?

Thanks