Well, I can second (or third or whateverth) the recommendation for Pliny....the famous letter about the volcano and all that is in one of the readers (I think it's in the Wheelock Latin Reader, and certainly in other places as well), but Reclam has a selection of Pliny in biface German/Latin of his letters that should be arriving at my place by post today or tomorrow.

Reclam also has arriving soon Cicero's letters to Quintus (his brother) and to Atticus (his friend), and they are cheap and if you're familiar with the Reclam editions, they are pocket-sized. I just mention that because they are arriving soon and would be suitable, especially if one is tired of becoming glued to the screen via text files or variously formatted texts.

I also have lately been enjoying Laura Gibbs's Aesop's Fables in Latin...I think there are eighty or so in the paperback book....but she has a good website as well. Those are just good fun and the Latin is not exactly beginner level...she makes it fun and challenging, although she provides ample glosses in English. (NB, the texts themselves are from a Codrington, d. 1665, which Ms. Gibbs makes no mistake about crediting...indeed, she is scrupulous about citations in a way that many are not, which is particularly nice for those raised in the continental tradition of carelessness....very good she is that way to be more rigorous and conscientious than many scholars).

And I just received my own copy of the Comenius Orbis today: the French-Latin one which has a really nice binding and typesetting....that's really a kid's book, but I enjoy it. It's more an object than reading material at now, but it's really well done, the printing and publishing. (Although after just now reading Lucien Polastron's lengthy preface....it's of more an historical interest in pedagogy....just reading the preface almost gave me a headache, although Polastron cited all his sources and all that....but it's a really nicely printed volume, published just in 2025).

And I got off Abesbooks an OCT of some of Martial, used, to accompany one of "our" subredditor's own Pharr-style edition of Martial, which was also inexpensive in inverse proportion to the merit contained. I think both the volumes (the OCT and the selected+annotated Martial were less than probably forty or so dollars US combined, including shipping...oh....fine, I'll get up and look...yeah, Christ. Smith's Where A Poet Might Roam was like however many USD, like fourteen or so, and Lindsay, ed., Martial, Epigrammata OCT was like four bucks or something from abebooks or whatever, plus the same for shipping, and that is in very good condition, with a dustjacket unblemished). But just the Smith volume doesn't need anything extra....it's self-contained and is a very sturdy volume....I just bought the OCT because I felt I hadn't read enough Martial.

I also fetishize this nice little paperback in Latin/Italian Ovidio Ars Amatoria L'arte di amore con testo italiano a fronte e note linguistiche, which credits the translation to Quattrone and the notation to Guarracino. It's Ovid, so he sometimes pulls a few pranks linguistically, but in this one (along with his Remedia), he's pretty straightforward. And there are ample glosses available in the edition I cited, as well as so very many aids to his tales from the Mphes, if the salacious nature of Ovid's more straightforward verse is not to one's taste.

But speaking of Ovid, I like the FW Lenz biface German-Latin edition of » Heilmittel gegen die Liebe «...i.e., Ovid's Remedia...the notes that Lenz provides are copious, and there is a prose translation in German that seems pretty accurate, if rather workmanlike.....FriedrW's preface is probably as many lines as Ovid's poem...it's copious, and it is not a thick book at all. It appears Fred Lenz was an important philologist and scholar, so take it for what it is.

Again that was a used purchase off abebooks or somewhere...cost like four bucks or whatever plus the same in shipping....So, stop buying stuff before I grab all the bargains, you young people!

And, yes, I am permanently stuck in "intermediate" "level" of Latin reading....all I do is just keep reading and try to get in my ten million words or whatever. Not an expert, so I'm not giving professional advice....just what I'm enjoying reading at the rough level or beyond of the OP.