Turtles' run seems underwhelming both DOM and OS. Maybe there are some inherent, box office limiting factors in the foundations of the franchise itself, because the audience metrics are by all accounts good.
I don't know if the animated side of Turtle things will fare better with this but the live action side seems allergic to sequelization: despite The Secret of the Ooze coming within a year of the 1990 original, it collapsed from $202m to $78.7m (both worldwide figures), and as we all know, the 2014 reboot did well but the 2016 sequel flopped. Very odd. It seems people are one and done with any one iteration of (live action) Turtles.