With Titans officially coming to an end after season 4, the series must provide the satisfying conclusion for Dick Grayson's arc that it's been promising since its very first episode. While the in the midst of its midseason hiatus, Titans received the axe from Warner Bros, with its sister series, Doom Patrol, also meeting a similar fate. This news wasn't entirely unexpected, leading Titans' showrunners to clarify that the current season's ending can indeed function as a satisfying finale to the ill-fated series, providing a glimmer of hope that its characters, especially Nightwing, will receive appropriate endings to their ongoing arcs.

https://screenrant.com/titans-show-ending-dick-grayson-become-batman/