Question why am i getting low fps in games

Mar 9, 2020
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mb: z170 asus
cpu: intel core i7-6700
gpu:1080 ti msi gaming x
psu: 850 watt 80 plus platinum
ram:16 gb ddr4 idk the frequency

this system is pretty good but im getting very low fps in games like fortnite and r6:siege
like around 100 fps in r6:siege (all low settings) and 70-80 in fortnite but i should get around 200 in r6:siege
i have the latest gpu driver
plz help asap
tia
 

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