How to improve Jitter issue via USB/ETHERNET ?

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You're welcome to your opinion, of course, but given that there are strong and easily-understood reasons why clock/inter-sample jitter should not be the cause of sound quality differences between USB cables, the onus is on you to explain how you "know" it's jitter in some objective way. For example, what experiments have you done to measure jitter (whatever you take that to mean in this context) and correlate it with the sound differences? Can you for example rank a number of USB cables in terms of increasing "jitter" in such a way that someone else could independently measure the same results? How exactly do you propose to measure this "jitter", even in principle? If you can't answer those questions, I'd argue you're not really talking about jitter, which is a well-defined, objective, engineering term - rather you're just saying which cable you think sounds best and arbitrarily attaching the word "jitter" to it with no real justification.

Just to be perfectly clear, I'm not arguing that you (personally) can't hear differences between cables - that's entirely up to you.