The big boss had been dealt with, and the major matters were basically over. The story was more or less coming to an end here—after all, one look at the protagonist's sorry state told you he was never meant to become an immortal.
If I kept writing and made the protagonist into some so-called immortal, his character setup would collapse.
As for tying up loose ends, I think my track record is decent. I've basically filled in all the major holes.
For example, the three bodies that ran through the entire story were actually already quite clear. If I kept explaining them, I felt it might become too much.
Because according to Qin Yang's philosophy, twelve was twelve, and the three bodies were the three bodies. They had to be counted separately; digging any further would be a kind of harm.
As for some minor loose ends, I'd see how it went. I'd do my best to fill in whatever I could, though some might not be suitable to address in the main text.
There were also some Schrödinger's loose ends that were better left alone. If every last detail were explained clearly, it would lose its appeal.
For example, what was Twelfth Master's name? Haha.