Well, your CPU is about equivalent to an i5-6600K from 5 years ago. Even though it's newer, it doesn't have very high performance standards. As a result, it will bottleneck the GPU. The other fault is that RAM. It's probably the second slowest RAM you could have used on that motherboard.
Another thing to note is your hard drives. You should either have the client installed on the SSD, or you should have those two SSHD's in RAID-0 and have it installed there. If the SSHD's are not in RAID, you don't want to put the game on them.
I'm surprised at some of your purchase options there. You really went all-out and overpaid for the motherboard and cooling, and then under-built the CPU, RAM, and hard drives. You could have easily saved about $200-300 on the motherboard, the cheap RGB on the RAM, and the overpriced AIO cooler, and purchased better products, and then spent the savings on better core hardware.
This game relies on fast and heavy CPU cycles with extreme access to the hard drive data. RAM timing is key, and basically your whole system is just bottle-necking the GPU so it's not able to fully function either.
This next part is going to sound harsh, but I assure you this is merely some helpful advice so you can make better choices in the future. (Or possibly look into fixing your hardware bottleneck.)
Going for the flashy effects on the hardware isn't doing you any favors. Something as cheap as an Evo 212 would provide better cooling than that AIO, even when overclocking. And it costs a fraction as much. ($35 compared to $160) For the RAM, you could have picked up G.Skill Ripjaws 4x8GB 3200MHz modules without the flashy RGB for $30 less than your Corsair, and would additionally be able to use the Quad-channel RAM system on that motherboard. That would set your RAM speeds at about 4 times faster than what you have now. Then you wouldn't be bottle-necking the GPU like you are now. Swap out that motherboard with a ROG Strix with nearly the exact same features for $100 less, and you've got more than enough extra cash to drop a couple of 1TB NVMe drives in RAID-0 for your games, or get a better CPU. In comparison, the overall system would cost you the same price, but would be considerably faster without a bottleneck.