In some Eastern religions, we are thought to be trapped in a long cycle of death and rebirth. When you die, you are reborn in another earthly body, moving ever upward as you build up positive karma in previous lives. Eventually, you break free and reach nirvana.
I think this is probably true, and the penultimate state before reaching nirvana is being a housecat that’s adopted by humans who mysteriously find themselves compelled to treat the cat as royalty. Proof below. Any being who can attain this much happiness, even for a few moments, obviously has no place to go next but nirvana.