PC UPGRADE (gpu or cpu upgrade?)
So the Intel Core i5-4670K Processor is a Haswell CPU which started production around mid 2013. They used to be decent CPU's for gaming, but they are getting old nowadays. 12GB of DDR3 (hopefully configured in dual channel) memory is quite nice to have and should last for the time being.
The problem is your CPU is pretty much 8 years old at this point and at the end of its life.
If you only have money for a GPU I'd recommend something like a used AMD RX 580 (4, or preferably the 8GB version), but nothing higher, since your CPU is most likely going to start bottlenecking your GPU at 1080p - what does this mean? Without getting technical it means that generally there could be a chance that your GPU will be spitting out too much information/too many FPS (in gaming for example), for your CPU to handle. So it will try it's best to keep up, but it will say: whoa, hold on there buddy I can't work that fast, to your GPU, thus limiting its capability.
Basically, if you want to buy a higher end GPU I'd recommend buying a new CPU, motherboard and RAM as well.
Why used? Currently GPU prices have risen all over the world, as mentioned by @SupaKomputa with the majority of sought after GPU's costing pretty much DOUBLE of what they should or used to.
This is the price for a new RX580, which used to cost around 160EUR NEW, but is now going for over 200 - 300EUR, which is NOT worth it.
I'd recommend you try to find a used RX580 @Robin K for anywhere from 100EUR - 180EUR OR wait for things to stabilize.

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