The Topic OP Moderation Plugin looks like a pretty full solution, and it’s hard to guess whether that last reported error will happen to anyone else. If you try it out, please share your experience in that topic.
(EDIT: irrelevant references)
(I misread OP and went on this tangent…)
If the plugin doesn’t work out, there are several old feature requests still open for this. As of this writing, none have any votes – probably because topic voting was only enabled in May 2024 – but you could be the first:
2020-11-04 The topic creator should be able to close it - Feature
2019-05-12 Ability for users to act as moderators on their own topic - Feature
2019-01-31 Allow Users to Close Their Own Topics - Feature
2018-11-16 Ability to close a topic you started - Feature
2014-06-12 Allow regular user to archive (or close) their own topic? - Feature