@FransLumbs See my previous answer for your sync issue:
(Question 16) As your note collection is small, it’s probably best if you do a full reset. Some details for how to do that are here How to fix synchronisation issues and start over
There is not any paid support option unless you’re paying for Joplin Cloud, as far I’m aware. Even if you did pay for Joplin Cloud though, I think the number of guaranteed support you get might be for a limited number of requests.
But you get free (but not guaranteed) support from the community, here on the forum.