@MartinSleziak I closed the questions you listed as duplicates of the 'revamping the closure reasons in 2022' post -- that seemed to me the most reasonable course of action. If you see any further posts which got obsolete by the changes to the custom close reasons, then please let me know.

@EmilJeřábek The updated "not research level mathematics" close reason will point users to Math.SE, with a somewhat longer and better explanation.

As to "7. Cross-post -- duplicate." -- Unfortunately, cross-posted questions cannot be closed as duplicates, as the duplicate must be on the same site.

@LSpice Some patience please ... .

@MartinSleziak Yes, there is presently one free slot. If there is agreement on this, I can add the proposed close reason there. (If it turns out that there are more important uses for that slot, it can be changed at any time.)

Given that the Featured tag expires after 30 days, I think it is rather meant to be used for somewhat more ephemeral posts -- e.g. for announcements and such.

@LSpice Well -- the alternative would be to suggest putting a bounty on the question. But given that the OP has only 75 points (which is just the absolute minimum needed such that the software allows setting bounties), this would perhaps be not such good advice -- and making a (substantial!) edit may be a better alternative.

@MartinSleziak Thank you! Though, besides -- I think Emil Jerabek has hit the nail on the head, beyond all numerical indices.

@MartinSleziak Maybe more interesting than merely counting posts would be non-CW question "h-index" / non-CW answer "h-index" (i.e. the maximum number $h$ such that a given user has at least $h$ non-CW questions / non-CW answers with score at least $h$) -- can you maybe write a SEDE query which computes this?

There were 3 reopen votes to the question cast soon after closure, which meanwhile aged away. There is presently one delete vote on the question. To get fresh attention to the question, you could perhaps edit it.

Yesterday (i.e. 27th of February) only 40 posts were made, which seems to be the lowest number since December 25, 2020.

Unfortunately, there is no such tool available to us moderators.

To me, that seems o.k. -- but the final decision is to be made by the community.