By - KyriosKrouse
Herodotus? He's not too difficult.
I’d recommend him too, if you’re willing to read Ionic Greek. It’s not too terribly different from Attic in my opinion, and not too difficult.
I like the Attic orators! They’re historical in that they provide a look into the politics of Athenian law, and as a bonus, there are some really funny/interesting stories contained in the corpus. Some authors are more difficult than others, but because most of the speeches are fairly short, they’re never too hard to work through. I liked Lysias, but he’s pretty easy. Demosthenes is good too, was significantly more difficult but very fascinating and had beautiful command of both rhetoric and the language.
The Attic orators are a good way to develop fluency in reading Greek. But read them with a very skeptical eye: they will only give you one side of the story, and don't necessarily adhere to the highest standards of truth.
Andocides' speech On the Mysteries is not too hard, and very interesting for the light it sheds on Athenian politics and religion, and a sensational but poorly understood event in Athenian history. There is a really good -- in fact, indispensable -- commentary by MacDowell.
I know he's very late but I just read through Lucian in translation and he's incredibly interesting and entertaining, it's no wonder so much of his work survived and he was consistently popular later on.
Oh, but I guess he is not Attic, so maybe ignore.
He's not Attic, but he writes in an imitation attic style which is basically the same thing. He's also incredibly fun - would highly recommend Vera Historia
If you mainly want to improve your Greek you should probably just keep reading more Plato instead of trying to find something harder that you won't be able to read as much of.
But if you specifically want a different author you'd probably be best off looking up a list of attic / atticizing authors and choosing one that seems interesting. It's important to care about what you're reading for motivation.
If I were you, I’d dive into Attic oratory, both because it confronts you with a whole new genre of texts and because it’s the best starting point for diving into the politics of late 5th/4th century Athens. Lysias’ first oration is often suggested as an entry point, and it is indeed quite funny, in a way. Maybe read that one first and then report back: Is the accused guilty or not?
Then read Andocides’ oration on the mysteries. Then Demosthenes, Philippica.
That sounds like a good plan.
Xenophon. He may be a small step down in terms of difficulty from Plato, but you'll read him with a sense of proper fluency, build confidence, and make the foundations of your Greek really solid, which will make the harder stuff much easier when you come to it.
I like Lucian
Plutarch is what I started with, wasn't too bad.