There are (probably) lots of ways to dry and store onions and stringing them, in particular, is a favourite of YouTube users. However, here’s an idea if you have the space, courtesy of plot22b. Store them in a dry place, upside down. This allows the moisture, to drain through the stem keeping them drier, for longer. Going to give it a try, as when I string them, they mostly fall off anyhow.
![](http://djallotments.org.uk/wp-content/uploads/2020/08/Screenshot-2020-08-03-at-16.27.48-1024x643.png)