What do dead souls do in heaven? Spend all their time praising God like mindless marionettes?
Imagine you made a simulation, and that simulation contains humans, from earth.
Let's imagine that this is, while probably quite ridiculous, something you did because you wanted to create a "friend" rather than a "robot", and while you know how to create "robots", and even give them some qualities, that doesn't usually turn out quite the way you would like.
So instead of engineering your own robot friends, you engineer a simulation where you can find friends who just precipitate from the chaos, evolve, and so you can take your time finding good friends!
But alas... Humans are... Human.
How can you justify having a friend, or rather how friendly is it really in any case, to bring something into your world and ask it to now live forever with YOU as their friend and to leave behind their old friends and families forever? Especially if the creator doesn't really care to be all that close of friends with most people, either because they're angry about their own existence or about the fact that god is already seeming a bit like a dumbass, and that many people would take that as an excuse or reason to kill and usurp the god were they to be in a physical room containing a physical knife with which to
effectively stab god in the back with it.
And you obviously can't place the trolls and the murderers and the rapists that people are still unfortunately attached to in the same place as everyone else any more than you can put them in the same environment wherein god's eminently killable ass is actually eminently killable because that's going to lead to problems.
So I imagine what you would have to do in heaven all day is to select from sleep, talk about "outside" or "the ongoing world" or even "various ongoing worlds" with people, learn the things you failed to learn before, troll people, get trolled, play combat games, maybe play around with some simpler universe simulations, or even play around and build your own.
But, every presentation of a supernatural heaven that I have ever seen seems to be kind of a compromise designed like a (posh) in-between holding cell as a stepping stone to either "more work to be done" or "oblivion".