Your MacBook has USBC and you need to plug in ethernet. This adapter does the job!
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Vention USB 3.0 Extension Cable USB 3.0 2.0 Cable Extender Data Cord for PC Smart TV Xbox One SSD Fast Speed USB Cable Extension
Aliexpress UK
1 LAN Ethernet+ USB OTG Cable. USB/ USB adapter cable for firestick 2nd 3nd Gen. USB Specification:USB 2.0. Connector A:USB Standard Type A Female. Cable Length:10CM-20CM. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.
eBay
USB 3.0 cable Short USB 3.0 Male to Male cable extension cord USB 3.0 AM to AM cable for cooling fan,Pad, Camera, DVD Player,
Aliexpress UK
12x Micro USB to USB A cables, 4x Apple chargers without power cable, USB B to USB A cable, Microsoft Mini-display to VGA converter, DVI to DVI cable, Apple thunderbolt cable, Apple mini-display/thunderbolt to VGA converter, Apple thunderbolt to Ethernet converter… enjoy!
eBay
USB Extension Cable Super Speed USB 2.0 Cable Male to Female 1m Data Sync USB 2.0 Extender Cord Extension Cable
Aliexpress UK
BENFEI TYPE-C to Ethernet Gigabit Adapter. Reboot your PC after driver installation, then connect this USB Ethernet adapter to your computer and ethernet;. This Lan Network Adapter does not support wii u.
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PD100W Fast Charge Short USB Cord Wire 20V 5A USB3.2 USB Type C To Type-C Cable 8K 60Hz Fast Charging USB Short Data Cable Cord
Aliexpress UK
High-Speed USB to USB Extension Cable USB 2.0 Adapter Extender Cord Male/Female. USB A USB C Type-C to Printer Cable High Speed Printer USB B 2.0. Universal USB Type C To 3.5mm Audio Headphones Jack Adapter For Android Phones.
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USB Extension Cable USB 2.0 Extension Cable Male To Female Data Cable Suitable for PC TV USB Mobile Hard Disk Cable
Aliexpress UK
Extend your USB connection to up to 150 foot!
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HIFI USB OCC Cable USB Type A to B USB Cable 6N DAC A-C Audio Cable OCC Silver Plating Data Cable
Aliexpress UK
1 x USB RJ45 Adapter Set(usb male to RJ45 female cable and usb female to RJ45 female cable). One cable is USB 2.0 male to RJ45 interface. Connect your USB device to your computer at a distance of up to 150ft with the help of a Cat5/Cat5e/Cat6 patch cable (LAN cable not included).
eBay
USB C Converter Extension Cable Type C Male to Female Cable USB C Round Panel Mount Cable USB 3.1 Type c Extension Cable
Aliexpress UK
1 x USB RJ45 Adapter Set(usb male to RJ45 female cable and usb female to RJ45 female cable). One cable is USB 2.0 male to RJ45 interface. Connect your USB device to your computer at a distance of up to 150ft with the help of a Cat5/Cat5e/Cat6 patch cable (LAN cable not included).
eBay
USB Extension Cable Male To Female Data Cable USB 2.0 Extension Cable Suitable for PC TV USB Mobile Hard Disk Cable
Aliexpress UK