You will need to create a new thread. The index will need to be updated to move the old thread into the deprecated section, and a new entry will be created for the new thread, which will have the "Uninstall: Old Plugin Name" in its metadata. The plugin updater will use that to auto-uninstall the deprecated plugin when the new one is installed.
And you should of course edit the first post in the old thread with a link to the new plugin thread.
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