Try another known working (at 1 GB) Ethernet cable.
Ensure that only one network adapter is enabled. In your case that would be the wired adapter. Any resident wireless network adapters should be disabled.
Disable IPv6.
Check that the network adapter's speed and duplex is set to auto.
Make and model information for modem and router?
Run "ipconfig /all" (without quotes) and post the results.
Windows IP Configuration
Host Name . . . . . . . . . . . . : DESKTOP-NSMJ9F8
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter Ethernet:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) Ethernet Controller (2) I225-V
Physical Address. . . . . . . . . : 24-4B-FE-E1-AC-BD
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 192.168.1.173(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Thursday, May 27, 2021 8:26:43 PM
Lease Expires . . . . . . . . . . : Friday, May 28, 2021 8:26:42 PM
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled
Ethernet adapter Bluetooth Network Connection:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
Physical Address. . . . . . . . . : 34-2E-B7-1A-9F-C2
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
I dont think that shows anything I shouldnt be posting but if it does please someone delete it or let me know.