We tend to get a new mythos or content once or twice a month. Every couple of months we'll get a new major chapter release. You get stones for clearing the content, killing mobs, building new gear, etc. Every now and then we'll get a bonus 1000 stones for an event (like an anniversary or major milestone reward), and sometimes we'll get the log-in rewards like we have going right now. For the most part though the game is pretty casual, especially since all of the content is permanent, so just make sure to log in each day for your daily rewards and then play at your own pace. >>429326
Nice, congrats! Look for the Two Knights side story (and then later after you've completed it, the First Knight side story). The first one unlocks Deirdre and the second one unlocks her 5* form. I think the first one had an area where you'll want Aldo to be around level 40 or so or in good gear (if I recall there's a moment where he has to fight some level 30 enemies all by himself). With the buffs Deidre gets from Miyu AS you'll be able to steamroll, plus Miyu's buffs are solid for everyone in general. I'd recommend a team with Miyu, Deirdre, Cress (from the Tales collab) and Yuri (also from the Tales collab) since he can cover healing. Cress sets up a Slash zone and gives bonuses to sword wielding characters, and all of those characters do slash attacks and wield swords so it should be really strong.
Finally, keep an eye out for the Lost Tome And Silver Flower side story. It's a bit grindy but when you're done you get Sophia who's a pretty good free healer and with her and your current team you'll be able to clear everything in the game. >>429330
It's just because we had our anniversary and then JP had their anniversary right after, plus we had the big Mythos release. Last year we got a bunch of chrono stone daily gifts around this time too.