If your body is completely destroyed when you die and no one can kiss it, will the dreamself take over or die ?

That’s a really good question. I would usually say ‘Tough luck, you’re totally dead’, BUT there are hints that this is actually NOT the case. Aradia was Vaporized, but her Dreamself is still alive- Pretty much in a coma, but alive on the Slab- Actually, it’s dubious if this means she counts as the ‘main’ body because it’s her only body before entry, or if it does mean that a Dreamself will become God Tier on the Slab even without being the ‘Main body’. Additionally, Aradiabot blew up after Ascending- And yeah, she’s a bot, but that does seem to imply whatever happens to your body if your Dreamself ascends alone, if it’s possible outside of weird and specific circumstances like those, is not pretty.

Alternatively? Use the next valid fantasy revival trope. No kiss possible? A tear fallen on the spot you died on will awaken your Dream Self.