So, I recently discovered that there were two Jump giga chapters made (Chapters 280 and 281) that follow after the CRAZY cliffhanger at the end of the manga (and anime)! They're so good, and anyone who wants a nice resoulution (until season 4 comes out!) should totally read them! It probably won't become canon in the anime, but a girl can dream! Here are the links to the translated chapters!
Chapter 280:: https://eyfey.tumblr.com/post/174328250600/can-you-translate-the-jump-giga-chapter-you
Chapter 281: https://eyfey.tumblr.com/post/176396892270/hello-have-you-read-new-saiki-kusuo-chapter-in
Have a nice day!