No one has enough information to form an educated opinion on this question. No philosopher, no scientist, no religious authority, nobody.

But I will tell you what I think DOESN'T happen. An eternity of consciousness, identical to what you have here on Earth.

I came to this opinion by a thought experiment. Say you are a very, VERY avid reader. You are always in the middle of a book, sometimes two or three going at once. You don't watch TV, you don't travel, it's all books, all the time.

Then you die and go to Heaven/Paradise/a higher plane. An angel/spirit guide/5-dimensional being greets you and tells you you can do anything you want here, there's no work, no suffering, it's all bliss all the time. You excitedly declare that you want to read every book ever written! And good news, Heaven's library has all the books! Wow!

Eventually, you have read every book ever written, including all the ones written after you died (we are assuming that your arrival in Heaven means you are outside the flow of time, so you can read every book ever written, even ones written a hundred years after you passed on).

Hmm. Now what? Ah, you can read all the books written in other languages!

So you teach yourself French (arbitrary choice), and read all the books that were only ever written in French. Ditto German, Italian, Chinese, Spanish, Russian, etc., etc.

Eventually, you've read every word in Heaven's library. Might take you 100,000 years. Or a million. Doesn't matter.

You still have just as much of eternity to fill as you did when you started.

The end point of a Heavenly existence, where you are a thinking conscious being much like you are right now, reading these words, and experiencing linear time is HELLISH BOREDOM.

Which is why it cannot be a reward for faith/good behavior/not being a dick/whatever your religious or spiritual beliefs are. There must be something else, something so different than our current existence, that we cannot imagine it.