[Gimp-user] Best way to upscale an image

for a photobook I need to upscale an image (showing a landscape) by a factor of 2. What are good (best?) methods to do so with Gimp, GMIC or other tools (I'd prefer
open source on a Linux machine)

I've read about neural network algorithms. Are they usable for larger (7MP) images without
enormous computer power?

Many thanks for your recommendation,

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