I had planned on reading Mistborn first - but seeing how highly praised Stormlight was on Booktube made me pick it up! Plus, I had just spent a lot of time playing Elden Ring which made me positively ache to get back into the high fantasy genre.
But the short answer is 'yes' - I definitely plan on reading other Cosmere series, likely starting with Mistborn.
So far Kaladin is probably my favorite of the main characters, but he's also the one I feel has gotten the most narrative depth in the first 150ish pages. Szeth seems fascinating. On Shallan, I must admit I'm more than a bit bored with female fantasy characters whose primary personality traits are 'bookish and sensitive' but her conflict has certainly grabbed me and I'm very interested in where her relationship with Jasnah goes.
Honestly, I hope Jasnah gets fleshed out - the religious systems of this world seem pretty rich and I'm curious how an atheist fits into all of this, especially considering how overtly fantastical this setting is.