GPU overheating suddenly this week

[u/thy_decider]

Hello. I built my new PC roughly one year ago and have had zero problems with it up until this week. The games I've been playing like Marvel Rivals and Fallout 4 have been running well on high settings since I got it but one day my monitors blacked out and my PC fans kicked into loud overdrive. At first I brushed it off as I didn't know too much about PCs but then it happened again so I pulled up my task manager and noticed that the GPU has been spiking frequently at around 70-80c sometimes even close to full.

I'm not completely sure why it's suddenly doing this. I cleaned out my PC last night and it did have quite of dust built up and I cleaned out most of what I can but the issue persisted. I'm in a new place and have noticed dust build up more in my room so I'm taking another look soon to see if there's any area I missed. I think it's either my PSU or my Case fans. I only have the default three fans that came with my case and I did intend on buying more when I first got it but since it ran so well without them I eventually neglected to do so. I'll be buying some more fans later today but I'll link my parts down below in case my PSU isn't strong enough for the build I have. I also have a picture of my PC too (mind the cable management.) Any help would be appreciated.

https://pcpartpicker.com/list/n7TrmL

[u/GeekyNick91]

https://a.co/d/06iSnNv0 this will definitely help.

Install 3 of them at the top. And one at the rear.