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Let questioners mark a question as answered (NOT like Stack Exchange's accept)?
I'm not referring to accepting just one answer like on Stack Exchange because your question can receive > 1 answer and each answer solves your question synergistically. No one answer solves your question, but each of them contributes to answering your question.
This doesn't duplicate https://meta.codidact.com/posts/277966#answer-277966 because an "solved" tag wouldn't attach to a particular post.
A "solved" tag is self explanatory. Not only does it remind me that a question is solved, but it will signpost to users to focus their time and effort on unanswered questions.