Sorry for your loss. Some tips
Definitely ring light and soft focus
Make sure the screen is raised so you are facing it full on rather than looking down in it - I put some big books under my laptop. Or a cushion.
Think kind of stage makeup if that makes sense - absolutely no need to do a full face or anything but some eyeliner or lipstick defines things a bit. I whack and I mean whack a bit of foundation, blusher or bronzer and eyeliner on (no need to be perfect at all - it takes a min)
Wear a top in a colour that is your most flattering bright colour. For me it's a bright ish blue. This really perks up the image Can wear pjs on the bottom.
I'd set up a zoom call for just you and spend a bit of time trying out some quick fixes in front of it until you fee confident. E.g. hair up or down, pair of earrings, necklace.
Then you can have a failsafe zoom "uniform" that you can put on with minimum effort/time.