Just another thing I thought about recently, which was having some kind of monthly quest. Not like skyblock or whatever where there's a whole list of quests or the weekly/daily ones which get kind of easy. But having a significantly "difficult" monthly quest, which has to have work put into it throughout the month, in order to gain a very substantial prize at the end of it. The quests would have to given from a large pool of monthly quests so that there isn't the possibility of getting the same one a couple of months in a row. I thought that this might give some potential to keep players engaged with Olympus, as once you've started the ascending process, there's not much else to do other than maybe go for leaderboard positions, which quite often gets taken by the same people every month, whereas having quests that everyone has to complete and put time into each month could keep players on Olympus for longer, and not keep them there just for the sake of a few people who still play. Obviously, the prize at the end of the month would have to be something that people actually want or need, like very large portions of mana, or 5-10 legendary keys (1 or 2 probably wouldn't be enough, especially if the quests are difficult).
The thing to this suggestion is that it would have to be completely different from the questing systems on skyblock and survival, as this is just one, significantly difficult, long, has to have time put into it, monthly quest which would eventually award the player with a more than substantial prize at the end of the month.