Novice upgrading to full-frame. Used Nikon Z5 & Nikkor Z 40mm f/2 a good start?

I can pick up a used Z5 and this lense (both in excellent condition) for about $888, after tax. I will primarily use the camera for landscape photography, but it will join me on hiking trips and serve for capturing memories and moments.

If you would advise another full frame option, what and why? Thanks.

(1) Budget, country, and currency:

Under $1000, USA, USD

(2) What equipment, if any, you have now and why is it no longer meeting your needs?

Just my S23 Ultra. Distortion in pictures, high-resolution landscapes come out with poor sharpness, lower resolution pictures are over-sgarpened, software updates have regressed image processing.

(3) What kinds of subjects do you intend to shoot?

Landscapes, astrophotography, portraits, and memories.

(4) Is it primarily for photography, videography, or both?

Exclusively photography.