How to "promote" a clonejail to a non-clone jail?

I have 4 clone jails, given the problems and data loss it caused me, I’d love to convert them to non-clonejails.
From my understanding, I have to use zfs promote, but I’m terrified of messing up.

Let’s say I have one old (oldest) snapshot named nextcloud and I have a recent francesco-202408041300 snapshot, how do I make it so the recent snapshot becomes the source of truth?