TL;DR: I want to have my question closed as a duplicate. But first I need to have the question reopened so it can be closed as a duplicate.
On The Workplace, I posted the question How early should I arrive for a meeting?, which I now want to have closed as a duplicate What's the best time to arrive for an interview / meeting / appointment?.
Before I had a chance to close my question as a duplicate, it was put on hold as "primarily opinion-based".
I still wanted to have my question marked as a duplicate for future users. However, the only flagging option available for a closed question is "in need of moderator intervention"
I submitted a moderator flag explaining my issue, only to have it denied.
I was told in chat to discuss the issue on Meta Workplace, where it was posted as Is it ok to reopen a closed question so that it can be marked as duplicate?.
Currently, it seems the proper way to have my question closed as a duplicate is to convince the community to have it reopened, just so I can vote to have it re-closed as a duplicate.
Can we have the option to flag our own posts as a duplicate, even if it has already been closed for a different reason?