Hi. I had the same issue as you, because like much of the world these days, I have to do a lot of Zoom and other video conferences, meetings, and a whole host of other mission critical face-to-face discussions and preparation in order to do my job. The bottom line is that the built-in 720p video camera on Apple laptops is simply not the most robust available, by far, but there are several meaningful steps one can take to make the camera work better, to get as much out of it as possible, and that's without buying additional equipment. With some additional (and not particularly expensive) equipment) the experience gets substantially better fast.
I have employed some workarounds and have come to a result that works really well for me, and my new MacBook Air 2020, without needing to get equipment (like a separate camera and/or microhone). I've researched it a fair amount and recommend you do likewise, as there has been a lot of stuff written online about this subject, Like the ones outlined by third party sources here, and here and here, just to name a few. The ones that have worked best for me are elevation of the lap top to just above eye level (using a stack of 4 solid, hefty sized books); ample, indirect lighting so that the face is bright and clear but not overly so; and making sure the background is neither revealing or distracting to convert a professional appearance. (Also, a strong, steady internet connection is super important as well.). If you really need better quality video there are lots of modestly priced, though not cheap, third-party video cameras (and microphones that add to a professional sounding experience) that you can connect that are full 1080p HD or higher resolution.
Hope this helps!
-- JDee