Enlarging a photo

"I need to enlarge them to roughly 9000 px by 12000 px at 300 pixel/inch"

No you don't. "300 ppi" is the most persistent myth in the history of digital imaging. You don't need that for large format prints, that is, anything bigger than a book.

The bigger it is, the lower the ppi requirement, because it will be seen from farther away:

7000 x 4600 pixels is enough pixels to work for anything, from a book spread to a wall-sized banner - as long as the photo itself is of good quality (infinitely more important). Enlarging will never improve anything, it will only degrade the image. It will inevitably end up looking worse than if you had just left it alone.

The only justification for upsampling, ever, is to avoid visible pixels, which is not even remotely possible in this case.

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You do not need to print a 30" br 40" image at a 300ppi resolution. Your 4640x6960 image printed at a 155ppi will print 30" x 45" and most likely be acceptable to you. Your image has a 2:3 aspect ratio  not a 3:4 aspect ratio.

You may not need such a file...

* What is the final print size in CM or Inches?

* What is the printing method?

* What is the image content?

* What is the viewing distance/conditions?

Take a look at this recent topic and search the forum for similar questions where this is discussed many times over:

https://community.adobe.com/t5/photoshop/working-with-large-files/td-p/11813729

The image size window offers a preview, if you must resample, use the settings that you think look good for the actual content.