Nope. You can't take back your boost/repost in Nostr, just like you can't delete a note on most clients.

Once you click it sticks

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I think the protocol allows for deleting posts (should check NIP01 again) but I'm not sure if any client has implemented that. Not sure if the protocol allows for removing likes/boosts

Thanks mate

You can submit your deletion event. Most relays are probably deleting it. strfry deletes it.

Oh cool - even likes and boosts can be deleted?

In any case, Amethyst doesn't provide UI for deletion at the moment. Maybe later we'll have that

Yes likes and boosts can be deleted. Iris and Snort has buttons for deletion of notes.