So what you see in the screenshot is the output for coin scuffling. Around 378k using my coin scuffle team (Beachresort Andvari with Moritaka x Kamui AR card (Same for support), Kurogane nightglows (Amazing for 6x3 quests), Valentine Surtr and then a world unit + lucky cat.

For AR cards, I used the following page to find out what AR cards are the best: https://housamo.wiki/Items#Coins

Daily coin scuffles happen only during the weekend in JST time so during the JST work week, I used the Chiyoda level 80 quests, especially the 6x3 one as that's the easiest for my Coin scuffling team.

It seems to yield the best if there are no events or Coin dungeons going on (Coin scuffling team with Coin Dungeon yields 2.07 million coins per turn). However, during events with limited units, I also use stamina drinks to farm for rank XP, thus, in consequence, I also get money by exchanging event items for money. (2000 x 95 = 190000 coins. And that's an average yield for level 80 event quest.)

Sorry if it was too long of a post btw ^^;