Nightwing continued to sell really well in July -
https://www.comichron.com/monthlycom...1/2021-07.html
Right now he sells more than Justice League, Infinite Frontier, TTA, and almost any other DC book.
I wonder if we'll get more Titans content in continuity. Tim Sheridan said that he plans to leave TTA in issue 12 (more or less), and it's not clear what happens next. Maybe they'll divide the book to the original Titans and the students.
Titans united is apparently not in continuity and is suppose to help the TV series fans get to know these characters in comics.