The Star Wars comic book series that has been produced by Marvel since 2015 is ending its run in November, which is just before the release of Stars Wars: The Rise of Skywalker.
Marvel Comics and Star Wars have had an on and off working relationship dating all the way back to the '70s, but Disney's acquisition of Lucasfilm in 2012 led to Marvel releasing its own Star Wars comics. Marvel has been running a monthly Star Wars comic book since 2015, which had a first issue that sold over one million copies, making it one of the best-selling single issues of a comic book of all time.
The Star Wars comic book series will be coming to an end in November, which will be shortly before Stars Wars: The Rise of Skywalker hits theaters on December 20. According to a solicitation from the publisher (via Comic Book Resources), the Star Wars comic series will end with issue #75 and it will conclude the "Rebels and Rogues" storyline that has been running since issue #68.
The end of the monthly Star Wars comic does not spell the end for Star Wars comics at Marvel, as there is an upcoming Star Wars Jedi: Fallen Order prequel comic that is due to run until December. There are also comics that are intended to tie into the release of Star Wars: The Rise of Skywalker, including a comic that shows Kylo Ren and the Knights of Ren embarking on a mission for the First Order and a direct prequel to Star Wars: The Rise of Skywalker called Star Wars: The Rise of Skywalker - Allegiance.
The reason the Star Wars comic is ending is likely to pave way for a new monthly series that will begin after Star Wars: The Rise of Skywalker has been released. Marvel Comics has plenty of Star Wars comics that are still in development, including Star Wars: Doctor Aphra, so it seems likely that the monthly Star Wars series will be replaced by something new. Star Wars: The Rise of Skywalker seems likely to shake up the canon of the Star Wars universe, especially if it's revealed that Darth Sidious somehow survived the destruction of the Death Star and has been manipulating events from the behind the scenes for years, and a new comic book series will be needed to accommodate the new stories that can be told in the wake of the latest movie.
Source: Comic Book Resources