If you did a speed test from your sofa then disconnect from your home wifi before the speed test.

Im just asking because you mention you are in your house so assume you are on your home WiFi network.
As far as cellular 5g you need to be close to a tower for higher speeds which can easily pass 500 up to around 750 Mbps. Close means you can see the tower. Or be within a mile.
The fact is, what can you do with anything over 300 Mbps? In most American households nothing, meaning the internet is used for domestic use. TVs, appliances, phones, computers and not downloading heavy intensive files as a course of business.
I did a thread on this here
This can be for any cell provider and why it's impossible to compare experiences around the country. Its location, location, location.
Also why some will trash cell based home internet service and others will praise it. The same example goes for cell service.
I live in a large community, miles of roads, some people have great experiences with T-Mobile Home internet and love it.
For our house, we are to far from the tower, in fact T-Mobile says its not available for us. I am quite happy with our 300/300 fiber service, way more speed than I can use.
Anyway, for this post, I ran speed tests...