Unfortunately you're out of luck on that one. The game is built upon one event early on, and a good portion of what came after was built on said event. Things have been developped like this for years, it's not easy to just up and suddenly shift the story and the game design away. The 7th Calamity is, after all, the literal icon of the game.
There's plenty that they can pick, sure, but everything in Eorzea is permeated by the events of the Calamity. And everything built since then has been Vertical. We can't suddenly have an event where Lv 15 players can participate going like "Ah yes, since the liberation of Ala Mhigo we've been working on this, this and that". It'd be fun, because there are plotlines that run outside the scope of the Calamity and the Ascians, but those only end up happening because said main scope opens the doors for us to do so.
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Having it be any different would require a mass-scale rework of the game, and at that point you might as well have a repeat of 2.0 anyway and wait for years until they do.
Saying "I've been playing since 1.0 and I'm tired of the old story" isn't indicative of anything. Because what else do you expect to happen now, them opening a random arc just like that? At this low a level? When the game's events are specifically strict because people are just now finishing repair work and coming out of the Umbral Era? Where Ishgard is still hostile to strangers, Ala Mhigo is still under Garlean control, Yanxia is under Yotsuyu's control and there's been zero successful liberation movements to prompt Dalmasca and Bozja to start trying? Where Gridania is still stuck in its "lets not hurt the elementals" ways, Limsa is still the first to pull out and still harassing beast tribes over resources, and the Monetarists turn Ul'dah into a non-involving nation?
"It's not my job to figure that out for them" is one thing. Another thing entirely is a demand that just isn't feasible with a bit of thought. Maybe they can write something, but due to the game's structure and narrative, they won't. Even if they do, for all intents and purposes, at that point in the story where the event is going on, the Calamity is still very much a fresh topic. Any further than that and you'd need people to be ahead in the story. You can get Horizontal stuff, but some things will still be locked out. If you have a Horizontal thing at, say, lv 60 all of a sudden, you can't mention Ala Mhigo, Doma, Bozja, Dalmasca, the Moon, Dynamis, the First, the Eorzean City States starting to come together... Because all that good sweet development is unfortunately tied to another story's progression.