Fix the light first
Light does more for a video call than a new camera ever will. Face a window if you can, and keep any bright lamp in front of you instead of behind. A cheap trick: put a lamp with a white shade just behind your phone, pointing at you.
If the room is dim, raising the screen brightness on a laptop gives you a soft glow for free. Avoid mixed colours, such as a blue screen and a yellow lamp, because they turn skin tones odd.
