You can only delete your snap if it has not be download by anyone. If this is the case a trash can icon will appear by the title. If it has been download you will need to file a issue here to have it deleted.
Information from this forum.snapcraft.io thread .
If you just want to pause a snaps distribution until a later time, you can close all channels, effectively making in unavailable.
To make it so that the snap is not found by searches on the snap store, change its status to anything but public.
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