@Feeee23 Cool, well, I'm not the greatest expert on Sanderson's works but I think you could either go on to read the rest of the Mistborn series (books 4-7), which is what I did, or if you're interested in his epic series, The Stormlight Archive, you could start that after book 3 of Mistborn and then roughly interleave books of Mistborn and Stormlight, which I think I would have slightly preferred in retrospect. If you take the latter approach, I definitely recommend finishing Mistborn books 4-7 before starting book 5 of The Stormlight Archive, because that book references some things introduced in Mistborn. (Even book 4 of Stormlight obliquely mentions a couple things from Mistborn, but that's not quite so important.)

And no pressure to follow back BTW - I mean, of course you can if you want to, but it's not expected. 🙂