Durarara

re:criators, and danganronpa

Then watch Mononoke
Mononoke

Made the same question a few days ago here : link
You can find a lot of good recommendations there ^^

My recommentions for you...

This season :
Mugen no Juunin Immortal
Spoiler for amazing scene ^^

Babylon
Why are you not watching this ? shame!

Other seasons :

JoJo no Kimyou na Bouken Ougon no Kaze
(If you gona watch this , pls watch all jojo franchise, altought this is the season with the best "Visual quality")

Kangoku Gakuen
Super fun and the visuals are amazing!

Mahou Shoujo Site
It's really worth ! (underrated)

Black Lagoon
Old school / 2 season is better (But still worth)

BANANA FISH
If you are into gay stuff (i mean , friend stuff) and a grate story this is it

Hyouka
Good Visuals ? There u go ^^ (Little boring ngl)

Manaria Friends
Give it a try.. its.. it's beautiful!

Miru Tights
What are you waiting ?

Ookami Kodomo no Ame to Yuki
Give it a try ^^

There you go , hope you enjoy ^^

(All spoilers are not "big spoilers" ? so u can see them :D)

Ganktusuou !

I recommend this one. It's short and great !
One Piece

Katanagatari
really pretty (one of the prettiest anime I've seen)

Lupin the Third The Woman Called Fujiko Mine
nice intro into franchise, unique visauls (for Lupin at least), but looking good and expressing general mood

MUSHISHI
breathtaking backgrounds

Ping Pong the Animation
if you aren't familiar wiyh Yuasa, give it a try, nice story and distinct visual style

Mobile Suit Gundam The Origin
really amizaing battle scenes and good animation, plus the best (that's non arguable) anime character ever created: Char

Seeing how much you seem to have enjoyed the Monogatari series and the original Steins;Gate, I would suggest that you look into the directorial catalogues of Akiyuki Shinbo and Hiroshi Hamasaki respectively. Their work is uneven in story quality but consistently visually impressive and incredibly distinctive. From Shinbo, the much-lauded March Comes In Like a Lion and the odd and underrated Denpa Onna to Seishun Otoko spring to mind as mandatory; with Hamasaki, I'll go with Orange and the elephant in the room, Texhnolyze—one of the best shows I've ever seen, and one of the most difficult to unreservedly recommend... if I were a normal person who didn't do things like tell strangers to watch Texhnolyze. It's basically uncut absurdism in the formal philosophical sense. It is very little fun. And it is awesome.

I would also look into two late directors, Satoshi Kon and the much less famous but similarly well-regarded Ryutaro Nakamura. You really can't go wrong with either, as neither seemed capable of making a bad-looking film or show.

In terms of writers, I would give the nod to Sadayuki Murai, who works primarily in adaptations yet consistently has a remarkable knack for elevating already strong source material with deft character writing and a finely honed emotional intelligence. Similarly, although more scattershot in the projects he found himself tied to and much more often tapped for original projects, Chiaki Konaka's mastery of quiet, spare moments and palpable mood paired neatly with his sharply observed character work and fascination with incredibly dense ideas which he usually managed to fit into his work semi-coherently. Unfortunately, he's barely worked in television in over a decade.

In terms of miscellaneous creative staff: Were it not for a certain recent misstep which banked heavily on his (very slight) involvement, I would say that Yoshitoshi ABe's record has been pretty impeccable, whether we're talking writing, concept work, or just his drop-dead gorgeous character and environment designs. Relatedly, the anime adaptation of Akihito Tsukushi's already brilliant Made in Abyss is simply a gravity well of top-shelf talent, and I really would not skip it even if Tsukushi's peculiar moe-adjacent style initially might put you off—although, again, this show gets real dark and real violent, and the film adapting the subsequent arc coming out in January promises to be even more ghastly (that was a tough read), so don't say I didn't warn you.