I’m not saying don’t get nicer cables. But, unless your current cables are really bad, too thin, aren’t making a good connection or damaged, don’t expect significant improvements let alone “vast”. Any differences a cable can make, again, assuming there’s nothing really wrong with your existing ones, are very subtle. IMO anyone who says the differences between 2 decent quality, properly made cables is night and day, is exaggerating a bit. Just my opinion though. Having tried quite a few myself, from $150 to $3500.
I have come to see nice (expensive) cables as 98% cool audio jewelry. Nothing wrong with that. Just don’t expect huge improvements.