Is the mortal instruments series worth reading? I know a lot of people say it is but I thought I’d ask you guys.

Ro Jacques The first two series you need to read are The Mortal Instruments (TMI) and The Infernal Devices (TID). The fandom disagrees on how exactly to do that. Some people think it’s important to read the first 3 books of Mortal Instruments, then Infernal Devices, then the last 3 Mortal Instruments. That’s the ‘official’ recommendation, but I think it’s unnecessary and annoying. I personally hate jumping between storylines like that, and the ‘Infernal Devices spoilers’ that people like to mention in the last Mortal Instruments book, which that reading order is trying to avoid, don’t seem to me like they spoil anything at all. You can do that, though, or read all the way through Mortal Instruments first, or start with Infernal Devices like I did. Basically, you can read TMI and TID in whatever configuration you like, as long as you finish all 9 of those books before moving on in the universe. Together they lay the foundations for everything that follows.
After finishing TMI/TID, many people read Bane Chronicles next. That isn’t strictly necessary; you need the background from the first two series to understand it, but it doesn’t have indispensable plot info that we know of (for now- this may change with next year’s releases. More about them later.) So you can read it at any point after completing TMI/TID. I don’t recommend skipping it entirely, it’s fairly hilarious and fills in depth and background for some of the plot lines. What’s crucial is that, after TMI/TID, the next thing you read (except, of course, Bane Chronicles) is Tales of Shadowhunter Academy. It has information you’ll need for the next series, The Dark Artifices (TDA). There are two of that trilogy currently out: Lady Midnight, and Lord of Shadows. The third, Queen of Air and Darkness, will be out December 4th. The most recent releases are the first 5 stories in the Ghosts of the Shadow Market collection. Those will continue to come out, 1 per month, ebook only for the moment, through November. The print edition, with two extra stories that can’t come out this year because they have Queen spoilers, is scheduled for 2020 publication. (It’ll take so long because there was a hasty scheduling shuffle this past January, and next year was already packed with releases.) I suggest you don’t read the Ghosts stories until after Lord of Shadows- they follow up on a TDA plot thread, so reading them earlier might be confusing, and they have spoilers for previous books. You should definitely read them eventually, though, because we know that the Ghosts stories are setting up plot for at least 2 of the final 3 series planned: The Eldest Curses, The Last Hours and The Wicked Powers. (Potentially setting up for all 3, but since we don’t know anything yet about Wicked Powers, there’s no way to know.) None of that is out yet. Most of it is too far away for any kind of firm release time, although Eldest Curses #1: The Red Scrolls of Magic is set for April 2nd, and Last Hours #1 is expected late next year.

No I didn’t after that. Does it pick up/change?

It definitely picks up and changes lol

If you liked the rest of the story, you really should finish it. It’s worth it, and there’s a lot more to that part that becomes clear