Fluvoxamine seems to be a lot more useful for treatment than ivermectin, and I see it online from China for as little as $5 per kilogram. But that's for bulk powder. Any Indian Pharmaceutical company could crank out tons of tablets price competitive with ivermectin. It's completely off patent and generic.

As for "vaccinating the world", the Oxford AstraZeneca vaccine was designed from the start to cost about $2 each to make, and has already been technology-transferred to any country that has the infrastructure to make it. That includes detailed instructions and viable cultures. Likewise the Baylor vaccine is being transferred to an Indian vaccine maker, with zero patents or royalties. It too, can be transferred for free to any country that has the infrastructure to make it, and it is done via yeast cultures: So simple any country that can brew beer should be able to make it!

Regarding treatments to avoid Long Covid following infection, I don't think any trials have been done, but Dr. Griffon reports that anecdotal info from the many physicians he talks with (as well as his own Covid patients) shows that vaccination within 30 days after infection seems to reduce your chances of getting Long Covid a lot. 30-60 days, less. And beyond that, not much at all.

Educating anyone benefits everyone.