I own a GX9 for about 1 year now. I bought it as a kit with the Panasonic 12-60. I'm very pleased with it and use my Nikon D800 with the Nikkor 24-120 very seldom since. The GX9 is a very small body with the disadvantage that the view finder is small as well which can be difficult when wearing glasses and shooting against the sun. You should try both GX9 and a bigger body.Panasonic G9
GX9 is even smaller
The GX9 replaced a GX7 (now my backup) and was kind of a Corona-buy after the 1st lockdown - means I didn't really need it. However the quality of the JPGs (color, sharpness) is closer to the D800 than those of the GX7 (which does not matter if you shoot raw).