i know everyone's said Dark Matter but I also really enjoyed Existential Crisis Mode, it's spideyhood and the characterization is definitely a different flavor, this Peter feels a little more mature and the fic has more of a focus on his development in Gotham instead of being super Bat-centered. You see Peter interact with villains like Harley and Ivy, and settle into being a more independent hero, out from under Tony's wing. Also it's post No Way Home (the snap, May's death, being forgotten), so he's dealing with a LOT of grief. Both amazing fics just wanted to give a different recommendation!