No, but is it possible to sync via iCloud?
Is not it possible to do it through iTunes?
I'm afraid of losing the notes I've been writing since 2014 and that's very important so I'm looking for the safest way
Of course. Just turn on syncing of your notes to iCloud. Sign in to iCloud on the new phone and then you are done.
If the notes are that important to you, you should be saving them to iCloud anyways.
No, but is it possible to sync via iCloud?
Is not it possible to do it through iTunes?
I'm afraid of losing the notes I've been writing since 2014 and that's very important so I'm looking for the safest way