If you’re curious about what differences/improvements you might get from better cables, I’d suggest that you pick one interconnect (maybe source to preamplifier) and try another Morrow Audio cable further up the line. If you don’t like it or hear a difference/improvement then return it.
I’ve only done a little experimenting with cables. For interconnects, I tried an Audioquest Chicago (RCA) and was impressed compared to my BJC LC-1 interconnects. I was impressed enough that I wanted to try something better and figured that moving up in an Audioquest product would be a more apples to apples comparison, so I selected the Sydney (RCA) based on design features and also the price point. It was another step up, but not as significant as the first step with the Chicago.
I got a new DAC so wanted to move to a balanced interconnect so took advantage of a Black Friday sale for some Morrow Audio MA4 (XLR) interconnects. They were the level that I alway had interest in and with the sale aligned with my price point. I’ve been very happy with them and consider them better to my AQ Sydney, but they technically are close to double for retail price so they should be better.
If you like the sound of your system, try moving up a few levels. You can trade in your current cables for 65% off, with little risk of them not sounding at least as good. If they end up being a worthwhile improvement then you could work towards upgrading your other cables.