At this point, the possibility of further Justice League movies likely hinges on the success or failure of upcoming spinoff projects like James Wan’s Aquaman, David F. Sandberg’s Shazam!, and Patty Jenkins’ Wonder Woman 1984.
Of course, we do need to note that there’s currently no word as to whether or not another Justice League movie will actually happen in the near future.
The film ends with the promise that all of the DCEU heroes will remain active in that world, and it suggests bigger adventures to come, but the film’s critical and commercial performance doesn’t necessarily bode well for an immediate sequel.