Prebuilt system upgrade?

Sep 30, 2018
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So I have a pre-built gaming computer but notice that it still has major fps drops in a lot of games that I enjoy Such as ARK:Survival Evolved,Modded Fallout 4,etc and not having more than bad knowledge on computers I was wondering if I'd there would be anything I could do to upgrade my machine. Here are the specs

Processor: Intel Core i7-8700K (6-Core) 3.70GHz
Motherboard: ASUS / MSI (Intel Z370 Chipset) (Up to 2x PCI-E Devices) (No SLI Support)
System Memory: 16GB DDR4 3000MHz Digital Storm Performance Series
Power Supply: 600W Corsair / EVGA (Supports up to an NVIDIA GTX 1080 Graphics Card)
Expansion Bay: - No Thanks
Optical Drive: - No Thanks
Storage Set 1: 1x SSD (240GB Digital Storm Performance Series)
Storage Set 2: 1x Storage (2TB Seagate / Toshiba)
Storage Set 3: - No Thanks
RAID Config: - No Thanks
RAID Card: - No Thanks
Internet Access: High Speed Network Port (Supports High-Speed Cable / DSL / Network Connections)
Graphics Card(s): 1x GeForce GTX 1080 8GB (Performance Edition) (VR Ready)
Sound Card: Integrated Motherboard Audio
HPC Processor: - No Thanks

any and everything is appreciated thanks!