With the current mining insanity driving GPU prices high enough it makes more financial sense to buy a gaming laptop or boutique system than to purchase a GPU on its own.  The alternative is to continue on with your current GPU, even if it is a bit long in the tooth.  Phoronix recently tested a battery of AMD and NVIDIA cards, focusing on older or less powerful models to see what kind of gaming performance they are capable of.  The switch to Linux makes sense as Microsoft is beginning to refuse to recognize older GPUs and blocking the installation of the older drivers they require.  You will have to turn down your graphics settings to reach playable FPS but there are titles out there you can still enjoy at 1080p.

"A request came in this week to look at how low-end and older graphics cards are performing with current generation Linux games on OpenGL and Vulkan. With ten older/lower-end NVIDIA GeForce and AMD Radeon graphics cards, here is a look at their performance with a variety of native Linux games atop Ubuntu using the latest Radeon and NVIDIA drivers."

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