I pondered this question, knowing that we have no answer. Some things we must take on faith until the time for their revealing. Yet there are those who have tried to tell us. To reveal our ignorance should not take a two part video. But there are those who try to fake it, and who should know better.
A common answer is "Serve." That doesn't help much. It's like asking about a job and being told it involves "work". So, I continue to ponder. I have no answer.
Some believe it will be a continuing use of our spiritual gifts, but these are given to serve the church in a worldly situation. Will there be two aspects--one to run the world during the millennium, and another in the eternal state afterwords?
The first is plainly the role of Israel and is revealed in the gospels as ruling over cities. Will angelic or church leaders assign us jobs? I imagine a giant board showing positions to be filled. Or a roll call where our names are called and jobs assigned. Will we have off duty times when we can just enjoy our mansions?
Every attempt to even ask such questions is an extension or projection of our Earthly experiences. Israel's rewards are so tangible. But the future life and duties of the church remain a mystery. An extension of our roles in the temple or church is posited, but does not seem to fill the bill.
Like a teen aged job applicant's inquiries about retirement benefits, my questions are inappropriate. We have our job assignments for now in the church epistles. We will know our fates soon enough, in the world to come.