An "idle" game genre by it's very concept means it takes very long time to progress so all those munchkins with deathly impatience crying "faster" should consider playing another game genre like RTS.

To facilitate this, the progress must be deliberately, strictly time gated and it should be impossible to reincarnate multiple times in a single day.

Thus, gem conversion could be only useable on a daily cooldown for free, with it's current ruby price for skipping it.

And abdication, as much more fundamental action akin to having revolution, could be enacted for a much steeper price, like losing all the gems (so it is cheaper in the beginning of a new reincarnation but more and more expensive as the current faction/alignment gets more heavily invested in) and being limited to a few times per reincarnation, or paying hefty ruby sum.