The question author adding a "conclusion" is a bit of an odd thing that does not naturally fit in Q & A format.

Nevertheless, on the odd occasion the question author strongly feels this sort of addition is necessary, and obviously benefits the site, the conclusion must go in an answer not in the question.

In the same way that people edit answers out of questions, they might also flag your answer as not being an answer at all. Moderators will review these if and when they happen on a case-by-case basis.

My feeling has always been to allow question authors a little extra latitude when answering their own question, but there are limits. To make it more of an actual answer, try to include e.g. some brief remarks about why you accepted the answer you did, with whatever small tweaks you might have made.

(Note that the edit you made to your question is not lost, it is available in the edit history.)

This issue has come up occasionally on main meta e.g. Conclusions are not part of a question.

Somewhat related on dba.meta: Edit helpful answer or create new answer?

The question author adding a "conclusion" is a bit of an odd thing that does not naturally fit in Q & A format.

Nevertheless, on the odd occasion the question author strongly feels this sort of addition is necessary, and obviously benefits the site, the conclusion must go in an answer not in the question.

In the same way that people edit answers out of questions, they might also flag your answer as not being an answer at all. Moderators will review these if and when they happen on a case-by-case basis.

My feeling has always been to allow question authors a little extra latitude when answering their own question, but there are limits. To make it more of an actual answer, try to include e.g. some brief remarks about why you accepted the answer you did, with whatever small tweaks you might have made.

As I wrote in answer to Edit helpful answer or create new answer?

Adding a self-answer to elaborate on the specific solution you applied to a more general answer supplied by someone else is not uncommon here.

This issue has also come up occasionally on main meta e.g. Conclusions are not part of a question.

Finally, note that the edit you made to your question is not lost, it is available in the edit history.