Dictionaries say if someone or something comes into their own, they become very successful or start to perform very well because the circumstances are right.
But I have a sentence in which the phrase obviously means something else, and I couldn't find it in any dictionary.
I exist as I am, that is enough. If no other in the world be aware I sit content. And if each and all be aware I sit content. One world is aware and by far the largest to me, and that is myself. And whether **I come to my own to-day** or in ten thousand or ten million years, I can cheerfully take it now, or with equal cheerfulness I can wait.
Here, I think, the phrase means "to die". But is it possible "come to one's own" signifies such a meaning?