A new blessing some people wish others before Yom Kippur is: May you have a meaningful fast. And this is why I abhor this.
Not eating or drinking on the Day of Atonement is so important that it overrides optimal praying. Jewish Law says that if you have a choice between full prayers (at home or in the synagogue) or fasting on Yom Kippur, you chose the latter. If you could only go to the synagogue or say your prayers at home if you ate, the Rabbis say: then don’t pray.
(If you need to eat for your health, you don’t have permission to do so—you are obligated to eat and drink. Those who must eat but don’t, sin worse than someone who should and could fast and doesn’t. There is nothing pious about endangering your health.)
So, it seems that the essence of the day is refraining from consuming. Not.
The essence is the prayers. That we say them with awareness and open ourselves up to taking them to heart and upgrading our inner lives.
Technically, Yom Kippur is not a Fast day. A Fast day is a sad day on which we fast to help us feel broken to have an easier time repenting.
But, Yom Kippur is a happy day. G^d gives Jews a chance to become more themselves again, individually, communally, and nationally.
On a Fast day, a young child may eat but should only do so not to be hungry, and not eat pizza, sweets, cake, and cola for the fun of it. But young Jews on Yom Kippur we give pizza, sweets, cake, cola, or whatever would make their day and makes them feel the festive part of the Festival.
Now, we’d waste a nice opportunity when we only refrain from foods and drinks on a regular Fast day without thinking about improving ourselves. So there, I understand a blessing that our fast will be meaningful.
But on Yom Kippur, rather than fasting, we pray to repent. We don’t even fast. We hope to be on such a high spiritual level that we couldn’t eat.
So, I bless us all that we will have meaningful prayers and that we will have the strength and happiness to spend the whole day in intense, happy prayer and not or hardly even notice the lack of food and drink.
NB: Sephardi-Jewish Law holds that the larger the crowd, the more we honor the King. But now, the larger the crowd, the more we honor the coronavirus. So, our religion obligates us to be wise and split up a bit.