Another thread where people with 0 knowledge tell people to waste money.
there is 0 theoretical improvements possible in a residential setting to “upgrade”.
there is no noise to remove. Ethernet noise floor is at -160 dB, so even if there was you have to be Superman to hear any difference, and only if digital noise translates to analogue, which is obviously does not.
There are no empirical evidence to support any claims made by anyone in this thread.
the only recommendation is buy a decent cable that gives you a good connection, which you already have. Like someone else pointed out, cat 8 cables are for 10G links, and so far I have yet to see a consumer streaming solutions supporting 10G.