"Cable Management" is an essential element of assembling a computer, but it "appears" there is none here.
Heat management is an essential goal too and the two go hand-in-hand. The goal of heat management is to ensure your case is providing a decent
unrestricted, front-to-back "flow" of cool air though the case. Totally unrestricted is not possible, but you can,
and should minimize the impact to that desired front-to-back air flow by routing your cables BEHIND your motherboard tray when possible, and tie back your cables when not. And with that "mid" (that is, not too tall) tower case being a
cavernous 8.4 inches wide, you should have no problems running many of those big cables behind the motherboard tray.
So it looks to me like you need to start over, especially with your power cables, so they come in from the motherboard's sides and not down through the "flow" and on to the board. Cool air to your RAM from the front of the case, for example, is almost totally blocked by the large 24-pin power cable and drive cables. And the 12V ATX cable (the yellow and black bundle) run right though the middle.
Proper cable management will reward you with cooler temps, less noise, and easier access for easier periodic cleaning. And to top it off, proper cable management presents the "tidy" appearance of a professionally assembled machine! A good thing. Instead of a "rat's nest" that restricts proper air flow through the case, and traps hard-to-clean dust that will surely hinder the extraction of heat. Not a good thing.
So now that you have figured out where all the cable connections go (a challenge since motherboard labeling and case wire labeling rarely match), I recommend you dis-assemble and start over, this time with the goal of routing and tying back every single cable in such a way that it minimizes its impact on air flow through the case -
WITHOUT putting a strain on any cable connector.