Tink i am glad you asked, you are in a (fortunately thankfully resolving) hotspot...if you can, the best route for D supplementation is, of course, a lab test to determine one's status. That can be difficult right now, when medical systems are overstressed...
But the dental assistant where I go, her physician tested her some years ago, and prescribed specifically for her until her levels tested okay. This assistant is very interesting person herself, she feels that dental work exposes her to all kinds of pathogens (the human mouth), and that daily exposure has helped her build a strong immune system. Which she augments with excellent nutrition, exercise, and supplementation of scarcer nutrients like Vit D.
Here is my own plan -- considering that I am age 75 and that elderly skin (also dark skin) is not as efficient at producing the vitamin: I am almost certain to be deficient, so I am "front-loading" (build up vit D in body tissues, especially fat cells of course) for a couple of months, taking 4,000 International Units (= 100 micrograms) per day.
Then at the end of July, I will drop back to 2,000 IU (50 mcg) per day, possibly even 1,000 IU, depending on how much time I can spend in the sunlight.
I chose 4,000 IU for this 'front-loading' because that seems to be the highest dosage for which there is a general consensus of safety -- although some physicians do advocate MUCH higher.
I remember you have a daughter, perhaps other dear ones you may be thinking of also...the good-sense source I use most for this question is a YouTube channel, Dr. John Campbell (not a physician, he is a Ph.D. nurse educator in the UK). He has 2 or 3 videos giving the research for Vitamin D (be sure you choose D3 not D2, it makes a difference) and if you are interested you could start with that channel. Campbell chooses his sources because they are usually peer-reviewed and high quality research.
He himself, I think he is early 60's age, I think he was taking 2000 IU daily, and maybe he has dropped back to 1000 daily for the summer, or maybe there are times when he takes none at all because he is able to be in the sunlight a great deal. It is from him I believe I obtained usable information of what is known about COVID-19. And then he goes on to strongly advocate Vitamin D3 supplementation to mitigate the effects of coronavirus infection.
So as you see, there is not a clear-cut answer, until one can access those lab tests!
Late addendum, couple hours on: Tink just today, I am watching this seminar John Campbell gave by Zoom at one of the universities in India, and I am posting it for you, just at the point he starts his summary of Vitamin D, which is 32:24. He begins by describing something I found interesting, which was in the 1918-19 flu pandemic, India lost a huge number of people -- but the deaths were fewer in the coastal areas. Campbell suggests that might be due to increased fish in their diet, and fish oil is rich in Vitamin D. Then he gives a brief summary of his own findings and speculations of how important Vitamin D is to both enhance and modulate the immune response, and how important it could be for India. They are starting their monsoon now, less sun, and many people especially in the south have skin dark in color. The dark skin may be a great factor for India, which has a younger population demographic than the USA or the UK, for example...old age skin less efficient in Vit D synthesis.
Here is the link, set to the Vitamin D discussion, nope I cannot get that to work, but you can just go to 32.24 to begin Vit D: