Here is how you can boost the Internet speed on your Chromecast and Firestick/Fire TV Stick 4k with the help of Ethernet. You can choose any of the following
Chromecast using Ethernet (MUS 155)
How to Use a VPN with Chromecast
How to use Ethernet Adapter for Chromecast? - All About Chromecast
Set up a VPN for a smart TV and stream privately - Surfshark
Buy
Ethernet Adapter for Fire TV Stick,Fire Stick 4K Ethernet Adapter,for Chromecast Ultra/Google Home Mini and Other Streaming TV Sticks.Micro USB to
How to Use Ethernet with Your Chromecast and FireStick - Smart DNS
How to watch American Netflix from UK or Canada with DNS Codes
Chromecast vs Android TV: What is Google's best solution for big
April Chromecast with Google TV update rolling out - 9to5Google
LAN Ethernet Adapter for Fire TV Stick Lite/4K Firestick 4k Max
Cable Matters 480Mbps Micro USB Ethernet Adapter up to Streaming
Steam Link on CwGT Slower speed w. faster ethernet-adapter? : r