Ethernet cable from Verizon Fios modem to iMAC not connecting

1. iMAC running macOS Catalina v10.15.7 will not connect to internet using ethernet cable.
2. Wireless connect works fine.
3. Thunderbolt Bridge is inactive and can't change to active
4. Rebooted iMAC and modem
5. Modem lights up
6. Fios internet speed is 300mbps

Can't find steps to active ethernet connection for faster speed

Appreciate steps to correct and connect.

Thanks