I’m with Jmcgrogan2, the system seems well put together. I think $2500 is too much for cables for this system. One idea is to sell the speakers, add the $2500 to the proceeds, and buy a 2nd hand speaker at the next level up in performance. The source and the speakers are usually the most important. If you are happy with your CD player, and the Jolida amp sounds good, perhaps a larger Silverline speaker that has more range such as this one
https://www.audiogon.com/listings/full-range-silverline-audio-sonatina-mk-iv-demo-2016-05-10-speaker... is a worthy thought.
Another thought is to focus on the source. You might consider selling the CD player, rip your CDs, go file based and invest in a top quality modern DAC.
$2500 is also a nice budget to get into vinyl. You can spend $2k on hardware and $500 on records and see where that takes you!
i think the cable upgrade idea or the amp upgrade are both worthy ideas, but I think you will get more changes in the source or the speakers. If you do go cables, I would lower the budget and save some cash for the next upgrade down the road. On the amp side, I would probably spend the entire budget, plus the proceeds from selling the Joloda integrated, and look at something like this:
https://www.audiogon.com/listings/tube-balanced-audio-technology-bat-vk300x-se-2016-05-08-integrated...Good luck!
Hope my 2 cents are worth more than just $0.02!!