Classic standards have always been more like 2 meters Minimum distance for portraits. 3 meters is common in professional studios, for even better perspective. Too little distance (like 1 meter) will exaggerate and enlarge closer features like noses. This distortion will not please the subjects.
The standard notions are the 105 mm lens is good for head and shoulders portraits on full frame 35 mm film, simply because the field of view will demand and force the proper minimum distance for good perspective. And for example, a crop factor 1.5 camera would use the equivalent 105/1.5 = 70 mm equivalent focal length for proper perspective. The distance will be the same either way.
Perspective is NOT about the lens. Perspective is ONLY about the distance, i.e., where the camera stands, and the view it necessarily sees from there.
If you want to improve perspective, you must change where you stand. The chosen lens might change where you must stand (for the desired field of view), but the perspective result is only about where you stand.
So stand back some. Zoom in all you want for the view you want, but stand back some if you want proper portrait perspective. Any kind of proper planning will include standing at the necessary distance. Perspective is the view seen standing at that distance.