The IT franchise was incredibly successful, with the first movie raking in approximately 701.8 million at the box office. While most loved the thrill the character of Pennywise had to offer, a great many people would appreciate a series dedicated to The Bowers Gang, a group of four teenage boys who were among the few antagonists in the first film. It would definitely be a hit, and with more added content of The Bowers Gang, it would make many fans happy. 

My personal suggestion is a series dedicated to all of the shenanigans and schemes The Bowers Gang are up to in the summer of ‘88, all through the rest of the year and flowing into the summer of ‘89. It would also be interesting to see a few interactions with Pennywise himself! With a casting of the original actors (Nicholas Hamilton, Owen Teague, Jake Sim, and Logan Thompson), it would surely become a very lovable series for all IT fans alike to enjoy.