Well, there's no real motivation that I can see for Esteemed Elders as they don't keep tally or give you totem poles like in the last game. If you enjoy making Esteemed Elders regardless, I would think that Farming, Research then Healing would be the easiest route to go. Thanks to the new set up, I've found it really easy to get a Master Doctor. Master Parents with speed kissing is another way, but I find that method mind numbingly tedious myself.