Thank you @cleeds and the confirmation from @foggyus91 @tuberist and @erik_squires. I am going to try a separate router that I have used for the previous internet carrier. That router has up to 1Gbps WAN port and could handle 1Gbps for 2.5ghz and higher BW for 5ghz. I will try it when I get home today and let you guys know.
AI also pointed out something similar and suggested performing IP passthrough to the new router, then disabling Wi-Fi broadcasting on the modem after the transfer so the modem only functions as a gateway/bridge. Makes sense. I am feeling hopeful now. Thank you guys.

