Question Why is my PC suddenly slow?

Oct 28, 2019
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SOMEONE HELP!!

I have built my own gaming PC 2-3 years ago. In all that time I've never had any problems running games on Medium/high settings 60+fps such as Bf1. PUBG, Csgo, Overwatch, Fortnite and etc.

For a reason which I don't know my PC just won't work as it used to be. I get 20-40fps in Fortnite where usually I used to get 200+ on medium/high settings for instance. But my PC has just been slow in general, a lot of crashing, Sudden shutdowns and so on.
Can someone guide me through this? I have tried such as reinstalling drivers and restart my PC from zero and downloaded all the drivers one by one. Have cleaned the PC, good airflow. Someone help?

Specs: Nvidia GTX 1060 3gb , AMD Ryzen 5 1600x , 8gb ram 2400Mhz, Msi B350M gaming pro motherboard, 1TB HDD and 500w power supply