After that fateful day against Starro, Batman would never go back to his isolation.

Source: https://www.cbr.com/batman-biggest-milestones-dc-comics/

His character was killed off in the latter, as John Cena's Peacemaker was under orders from Amanda Waller to keep the U.S. government's role in bringing Starro to Earth under wraps, by any means necessary.

Source: https://comicbookmovie.com/suicide-squad/joel-kinnaman-wants-to-return-to-the-dcu-as-an-unrecognizable-nasty-villain-with-a-big-costume-a208132