Yes, I realised quite some time ago that I could do with a graphic card update. It's not that simple though - when I looked into it I discovered I had been sold a PC that could not be upgraded in this way - thank you Dell.
So if I do want to step it up a bit it would have to be a new PC - which at the moment would have to be fairly low down on my list of financial priorities.
Think ypur current gfx card maybe AGP. Everything is PCIE now.
Tbh a new is probably thd better way to go. Its alot cheaper to self build too. I have been doing that for the last 20 years.
It can be done on a budget, theres no need to go silly. But the biggest single upgrade anyone can do is get an SSD drive.