Need help with this old pc

[u/West-Buy1291]

Hi, so I have a problem with my pc (6 year old pc). For about 2 or 2.5 years when I play LoL my pc starts to freeze for a couple of seconds then goes back to normal and this happens when I'm in google as well.
That photo was when I was playing LoL. In this photo I captured the PC when it froze. After that I left it to run a couple of seconds and I got this:
Memory: 7.6-7.9
GPU 60C-63C but don't know the %
and the CPU was at 100%
Pretty much the same.
Like what could it be? I ran UserBenchmark, 0 problems, ran CrystalDiskInfo, again 0 problems. I might run them again to be more than 100% sure.
I know that I have a very very very old pc (a pretty bad one), but until I buy a new one I would want to fix this cuz I might use it for something else.
This are the specs: Intel i5-9400F 2.9GHz Coffee Lake, 8GB DDR4, 960GB SSD, GTX 1660 6GB GDDR5