Unfortunately technology does move forward. But much like in components, high end stuff does not go out of date as fast.
I am retired as well and understand your dilemma. But I also just upgraded my system and all of it’s cords. No question there have been some big advances. But I think given your situation assume your existing cords are still excellent… and replace what is likely to make the biggest difference. The amp power cord.
I tried a number of amp power cords… they made a big difference… but none of them got it right. Finally after a year… my dealer brought over an Audio Quest Hurricane. It was hugely different and all better. I recommend trying this… and then assume the changes on other stuff will be much smaller. They didn’t normally sell Audio Quest… but the forums and audio community was abuzz about them, so he bought one.
Once I got my components all squared away. I took my time in adjustments. Given your interconnects are high quality. I would not look to move quickly. If you are really enjoying your system and are retired (as in no longer in “must finish this immediately” mode. You can casually take a look at another cable next year. Anyway, I have been retired for five years… relaxing more and enjoying more… not being in a hurry. A couple hundred hours or more before considering the next change gives you incredible insight into what your system sounds like and sensitivity to small changes. So, repositioning after another 500 hours can result in better sound. Etc.