Some Fire TV Stick owners struggle with poor WiFi signal strength. The combination of a small internal antenna, due to the device's compact size, and being crammed behind a TV will often result in bad reception.
I turned my rooted Fire TV (2015) into an SMB server for a PS2 Slim running OPL : r/ps2
USB 3.0 to Gigabit Ethernet Adapter RJ45 - USB and Thunderbolt Network Adapters, Networking IO Products
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Say Goodbye to Unstable WIFI Connection: Suffering from unstable connection when connected wifi signal for your fire tv stick? Our Ethernet Adapter
Ethernet Adapter for Fire TV Stick, Micro USB to RJ45 Ethernet Network Adapter Compatible with 4K Fire Stick
Connect Your Fire TV Stick to an Ethernet Connection
UNLOCK][ROOT][TWRP][UNBRICK] Fire TV Stick 2nd gen (tank), Page 44
This all-in-one adapter is the easiest way to add Ethernet to the Fire TV Stick
FireTV Stick + Ethernet + USB hub with external storage
Why is My Firestick So Slow? 9 Ways to Speed It Up!