ethernet problems

So I bought a Cat 7 50 foot ethernet cable and a usbc to ethernet adapter for my note 9 thinking this will finally bring the speed up dramatically. Unfortunately its hit and miss I get these readings below . Am I doing this wrong ?? cause in the picture below it shows the i need to set up the ethernet connection even tho it is . And when I go into this it says turn off the ethernet connection. I did purchase a cheap 20 dollar cat 7 flat ethernet cable.

Should I buy a cat 8 cable for more money and that may solve it or am I connecting this up wrong ?

I have ran a my modem test and it says that the speeds should be 1000mbs

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