Why should I care about becoming everything again?

[anagogy]

You mean the Universe is eternal and won't die out from a heat death in a trillion years or so?

I mean, even if it does there are others. And your soul isn't bound by time anyway, so the physical lifespan of the universe is inconsequential in the greater scheme of things anyway.

Why should I want to experience growth and broaden my perspective? Why should I strive?

Because the alternative will never be satisfying in the long run. You will get no satisfaction from not growing. Oh, and by the way, you can't stop growing anyhow. You can only slow it down. Can't actually stop it.

Even if you don't expand, your Higher Self is expanding. You just feel bad when you don't follow its expansion. Nobody likes to feel bad. And people that claim to do, don't understand what feeling bad is.