Hi, welcome to the forum!
Nice little case, good find!
Just a bit lol 
Since there is no place to hide them, you would need shorter cables first. Or even better, no cables at all.
Are the 2 SSDs really needed? Big part of the spaghetti comes from SATA power and data cables.
I would have gone with one m.2 for the OS (and games), second one for your data.
According to the last picture, you've added two input power options, one C14 socket and one C5 socket. Why is that?
Having only the smaller C5 should have been sufficient and would avoid the extra cables of the C14.
Finally, the two low profile 'PCIe' cards.
Hard to tell what's the one closer to the mobo, HDMI? What is it for?
The other one seems to add two USB ports to the build. But as you have some unused ones on the I/O of the mobo, an USB hub could be an option to replace that card. Would be a plus since this card is interfering with the PSU.
With all the above cables gone, only the HDPlex cables will be left and you can arrange them better with the free room now available.
Next step will be custom cables at the right lengths for your build. Beware of that rabbit hole
And oh, since nothing is attached to that top bracket, you can probably get rid of it and have a little more breathing room for the CPU cooler.
