The basic idea was 20 floors, I don't know if they changed their minds later because there have been many twists and turns with this theme.
What if I know is that the hell, they could create a "Bodaverse", if they have tired of the idea of the tower and its floors, it would simply be to implement an X floor, put some plot, I don't know maybe about your Master, Rose and her mother and how to create a portal through which they escape, thus ending TOT.
And now from there they could link all the secondary games they wanted to serve as sequels.
(An example, let's imagine that heelfall has not yet come out, it would be simply to replace the protagonist with ethan and who arrives in a portal is in the middle of the war, hears news about rose or something like that and decides to help the soldiers against the queen and such in search of answers, and so with everything).
Honestly, the idea attracts me and I think it would be relatively easy to make it fit.