(Someone just asked about this, so in case you missed it:)
You can leave conversations on Mastodon by using the "Mute Conversation" feature. More info and instructions at:
➡️ https://fedi.tips/muting-conversation-threads-in-mastodon
This works for any conversation thread you've been mentioned in. You can also unmute the conversation if you change your mind.
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All GNU social JP content and data are available under the Creative Commons Attribution 3.0 license.