ImapGoose look and feel real nice for syncing #IMAP #mailboxes:
https://git.sr.ht/~whynothugo/ImapGoose
I have had isync setup for the same task once, and tried a while back getting it set up again, but ran out of spoons. It's needlessly complicated for my needs.
ImapGooset is a pleasure, took me about 15 minutes to build and configure. What a joy.