Internet Slowing down when using Ethernet

I just bought a PC and recently have upgraded my internet speed, it used too be 10Mbps and now its 20Mbps but i am not getting those speeds on my desktop that has been using wired by Ethernet. My wifi is hitting 20Mbps+ easily. I tried too connect the same Ethernet cable to another laptop and that reaches 20Mbps+ very easily. This made me realize it might actually be my motherboard. My motherboard is a AsRock B650M PG Lightning WiFi, I have tried everything like updating my drivers, checking my router settings, reinstall updated lan driver from the official website, reboot the router, deleting all network drivers in device manager and letting it reinstall them after restarting my Pc. Is there anything else i could do ? Any help will be appreciated.

Thanks