[Akuma]

First of all, what case is that? I want to find some pics and see if there are any good places to route your cables.

That's not too bad. You got most of the wires away from the motherboard and out of the main air flow path. It doesn't look great, but it will work if you don't want to do more.

Does your case have any holes near the PSU? If so, run some of the smaller wires behind your motherboard tray (you'll have to take off the other side of the case). For something like the 4 pin mobo power connector, you should only have to see a tiny bit of that since it's right near the top. If you don't have a hole near the psu try tucking the wires that higher up behind the PSU, between it and the case, if there is any room.

The 20/24 pin connector is always a pain in the ass. You might not be able to do anything else with it.

Another option is to buy some large diameter split tubing. If you can't do anything with that one large group of wires just put them inside some silver split loom.