I remember I think five or six years ago I read a series of fantasy novels from the library which were really interesting, but I forgot the names and stuff now. I’m not sure if it was an Australian series or not, but I remember it was a bunch of (probably) short fantasy stories written by a bunch of different authors, centered around a fantasy world but following different characters and plots. I just remember the first story (i think) had something to do with a guy becoming a guard or something, finding some sword and something to do with skeletons, I think, and another story about a girl and some riddle regarding a plumbob with a mason. Also, for some reason my memory is relating it with Deltora quest even though it has nothing to do with it (similar name?)
You'll have better luck asking at GoodReads, specifically their discussion forum since it's pretty active. Check them out here https://www.goodreads.com/topic Also, if you want to browse through a list of published/physical books with multiple main characters try this list first, you might find what you want. https://www.goodreads.com/shelf/show/multiple-main-characters