What is the most efficient way to farm for eidolon orbs? I have been farming standard disaster raids, all 18/day and so far, I am averaging around 2 SR eidolons per day, which is only 60 orbs. I sell all the R eidolons from gem gacha without a +1, but that only averages about 10-20 orbs per day. So, at best that's like 80 orbs per day or around 2400 per month, which is still less than half the 5 shards per month from the shop.

Is there a more efficient way to get orbs? I can solo-AAB expert disasters if need be, but not sure if the drop rates are better to offset the higher AP cost relative to standard (which also takes a lot less time.) I cannot reliably clear any ultimate disasters yet except light (or clear it enough to attract people joining and finishing it for me.) I also tried farming the current raid event (Fleurety) but after a few hundred raid gacha tickets, I got exactly zero eidolon pulls (I got all 5 copies from soul rewards already.) Event SSRs are only worth 150 orbs, so if I get just one pull per few hundred tickets, this seems less AP/time efficient than standard disasters. Am I missing another obvious source of orbs?

For context, I need orbs for past event eidolons as well - played for less than 2 months so I have none of the ones in the shop... My first event was Nandi, and did manage to MLB her as well as Thunder Lilim and Fleurety, but they all suck for a light team, which is what I have. Been working to MLB Barong from shop, 1 more copy to go, trying to speed things up if possible. If there is a better source for good eidolons and/or draconic eyes other than the orb shop, do let me know, too.

For draconic eyes, I have been doing the weekly missions, all events that I can (which is like only 2 shards per event?) and eidolon orb farming/shop. Did I miss any other sources that doesn't cost a fortune in real money?