Prestige currently feels like an impossible goal. I personally feel like the amount/value of the orbs that spawn per second is super low.
Personally, I think that the game should keep track of the amount of each tier orb there is and try to make sure there's at least 4 or 6 of each spawnable tier by using a dynamic weight for the chances to spawn. I also think that the maximum number of orbs can be increased, or it could be a scaling amount that you can upgrade. That way if someone wants to actively play they can, and if someone wants to idle/AFK they can still do that as well.