"So my opinion is, receiver is much much more better than Ethernet" I am really curious, how exactly do you think is this receiver better than Ethernet?

https://powerusers.codidact.com/uploads/JwT4tgD9HcvQAKE4r7D8Go9Y

That's why I think.. I was using Ethernet before buying receiver. And ethernet was slower than this. That's why I believe Receiver is better

Lol no. Absolutely no. Your screenshot is not showing ethernet speed. It's showing the speed of your internet connection (internet is not the same as ethernet -- the two words mean and describe two entirely different things). Even the ancient 100 Mb/s ethernet from 1995 is obviously faster than the 3.4 MB/s (~ 30 Mb/s) shown in your screenshot.

OK! I will add a screenshot of downloading speed while using Ethernet..

That's pointless and nonsensical. That means nothing. Connect your Wifi to the same slow internet connection, and then make a point about Wifi not being faster/slower than ethernet in your case because the bottleneck is the speed of your internet connection, or due to differences in the two different routers/modems you are using...

Perhaps more to the point, there's about a gazillion things that can influence download speed from a remote host on the Internet which are completely unrelated to how your computer is connected to the very next node over on the local network, especially when you aren't trying things out at the same time. Other than simply reasoning about the properties of each, there are ways to actually test and compare the speed of different network types, but it takes a fair bit more than just downloading something (even the same thing) repeatedly. Also, wireless by definition uses a shared resource (you're potentially sharing the radio spectrum with other people nearby, the behavior of which is out of your control), whereas wired connections tend to be more predictable.