Delete a published theme to replace it with a higher quality version of the same theme

I made a theme and when I tested it myself on my pc, the quality was HORRIBLE. so I made it again with a proper 4k image but when I sent it, it said its a duplicate of the crappy one. how do I delete it???

If you go to your Manage Submissions page, you can delete a theme from there.
https://addons.mozilla.org/developers/themes?sort=created

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