In general

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You're probably too INVOLVED to close a discussion if, in the last couple of years:-

  1. You've expressed an opinion about this topic or a closely-related one;
  2. You've !voted in a community process such as an AfD, an RFC, or an RM about this topic;[1]
  3. You've made an edit that takes a position about an article closely related to this topic;[2] or
  4. You've had a serious disagreement with the nominator or another major participant in the discussion.

Fraught topics

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Be more circumspect if this discussion is about a fraught topic. It's fraught if there's a serious or widespread dispute involving substantial numbers of editors; if it's being mentioned on AN, AN/I, or at the Village Pump; or if it's a designated contentious topic. In that case consider letting someone else close the discussion if, in the last five years or so:-

  1. You've expressed an opinion about this topic or a related one;
  2. You've !voted in a community process about this topic or a related one;
  3. You've made an edit that takes a position about this article or a closely-related one;
  4. You've clashed with or sanctioned a participant in the discussion;[3] or
  5. The discussion relates to your profession, your religion, the politics of your home country, or one of your main areas of interest on Wikipedia.

Notes

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  1. ^ Closing a discussion doesn't make you INVOLVED.
  2. ^ Examples of edits that don't take a position: Fixing spelling or grammar; rephrasing a sentence without changing its meaning; adding or removing an uncontentious template; accepting an article for creation.
  3. ^ Issuing a warning, or calmly discussing or clarifying that warning, doesn't make you INVOLVED.