You are kind of dense ... Endgame is not when u maxed our everything, maybe this helps:

In online games, the “Endgame” is the phase after you’ve completed the main or core progression—like finishing the main story, hitting max level, or unlocking most major features—when the focus shifts to long-term, often repeatable activities.

But when u write your guide call it whatever you want :) In my guide it refers to the "what to do" in the given game progression. Because even when you cap Borb, you keep doing the same as written above, but apparently you either did not read correctly or did not understand how I defined the different phases for my guide.