Question Why has my minecraft FPS gone down from 500 to 60?

Dec 19, 2020
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Hello
I know that 60 fps is good but i dont want to have wasted money.


PC Specs

AMD 3.4GHz Ryzen CPU
8GB GeIL Memory
ASUS A320 Motherboard
Kingston 240GB SSD OS Drive
PLE Storage Drive
XFX Radeon RX580 GTS 8GB Graphics
Deepcool Case
eVGA 600W Power Supply
Microsoft Windows 10 Home

I have had the pc for a week so its pretty new. I average about 400-500 fps in hypixel and suddenly i have been getting 60-70
I know thats not bad but i just want to not have spent alot of money for no reason.
Please help that would be great.