Hi, I have a question, I speedrun a niche game called Sky Serpents and the waiting time for verification will soon exceed 21 days. Is there any way to verify the rune other than writing to moderators who have not been online for months or simply do not reply and do not care?

Once 21 days have actually passed, I believe you are clear to request to become a game moderator yourself by submitting a ticket.

Request to become a moderator of a leaderboard when all existing moderators are inactive.

Moderators are considered inactive if they have not logged on or verified a pending run in at least 21 days.

You should at least try to reach out via their linked social media profiles first, though:

In the case of inactive game moderators, please attempt to contact them via social media to resolve the situation.