Justice League 2 Watch
Unlikely a Justice League 2 will happen any time soon, if ever. The first one was a big disappointment and both Henry Cavill and Ben Affleck have moved on from the lead roles. Keep your eye on the other upcoming DC films like Joker, Wonder Woman 1984, Birds Of Prey, The Batman, The Suicide Squad and eventually Aquaman 2.
Birds Of Prey arrives in February 2020, before Wonder Woman. Unless you count Joker which is expected in October this year but isn’t officially part of the DC Extended Universe.
On a more serious note, I hope they don't bother trying another ensemble film until they've properly found their footing with individual films and established a roster of characters that people are emotionally invested in. One of the biggest issues with the first JL, besides having too much Snyder involved and generally being a testament to mediocre filmmaking, was that they jumped straight in with an ensemble film to introduce key characters, and we simply didn't give a sh*t about them.