Frieren: Beyond Journey’s End is up there for me.

Tengen Toppa Gurren Lagann

Steins;Gate

• Haibane Renmei
• Anohana: The Flower We Saw That Day
• Love, Chunibyo & Other Delusions!
• A Silent Voice
• Sweetness & Lightning
• Akebi's Sailor Uniform
• March Comes In Like a Lion 2nd Season
• A Place Further Than The Universe
• Non Non Biyori Nonstop
• Frieren: Beyond Journey's End

Kaguya-sama, a Frieren-tier-global-recognition all-rounder romcom

To add some not already mentioned

• Apothecary diaries
• Dan da Dan
• Heavenly delusion
• Puella Magi Madoka

If you don't mind older series, I think these are worth a recommendation:

• Bakemonogatari (and the rest of Monogatari series)
• The melancholy of Suzumiya Haruhi
• Black Lagoon
• Clannad

Honorable mention for Nichijou. Perfect comedy if you ask me :)

First season of Psycho-Pass. later seasons got a bit too muddled and had some repetitive antagonists, so I wouldn't recommend continuing it. Shinya Kogami and Shogo Makishima's rivalry is the real meat of the story, and getting rid of both characters at the end of S1 just killed all of the show's momentum. Gd, what a rivalry though.

Oh yeah, and the animation, visual style, and music all slaps. There's also great side characters that get a few moments to develop and stand-out, and most of them didn't get brought along to later seasons either.

Shows:

• Cowboy Bebop
• Kill la Kill
• Steins;Gate
• Fate/Stay Night: Unlimited Blade Works

Movies:

• Paprika
• Spirited Away
• Your Name
• Summer Wars
• Akira

• Legends Of The Galactic Heroes
• FIST OF THE NORTH STAR
• Records of Lodoss War
• Ghost In The Shell: Stand Alone Complex
• HELLSING
• Cowboy Bebop

To add a couple to the great ones already listed:

• S1 One Punch Man
• Naruto (pre-Shippudden)
• Code Geass
• Demon Slayer
• Elfen Lied
• Jujutsu Kaisen
• Re:LIFE
• Vinland Saga
• Zankyou no Terror

• Oddtaxi
• A Place further than the Universe
• Madoka Magica
• Made in Abyss

Akira

Erased

The perfect anime is the one that captivates your interest for its entire length and delivers an ending that is satisfying. The story is completed, but you don't want it to be.

Azumanga Daioh

Takopi's Original Sin

A Place Further Than The Universe

Spirited Away

Liz and the Blue Bird

Ghost in the Shell

Mob Psycho

• Monogatari Series
• Gintama
• The Dangers in my Heart
• Kaguya-sama
• Saekano

Gotta be Cyberpunk Edgerunners for me. Nothing has captivated me and made me love the characters as much as that show did.

Hunter x Hunter is probably my favorite. It's still technically ongoing, but the mangaka has serious health issues so the current arc hasn't progressed much. The anime does close out on the best arc ever, so it's a pretty satisfying stopping point. The 2011 anime, mind you. The 1999 one DRAGS ASS. Avoid it.

Medalist.

Ping pong the animation

Orb: On the Movements of the Earth

It's Girls Und Panzer for me. The original 12 episodes the most. You could feel the artists doing their best and the characters are fun and memorable, imo.

Seirei no Moribito.

To Your Eternity

• sleepy princess in the demon lords castle
• ya boy kongming
• the corporate slave and the little baby ghost
• eyeshield 21
• hajime no ippo

Nichijou is one of my favorites of all time.

Mushishi

I realised just recently, that having even normal scene progression choreographed with background music, makes a great difference in the impact it makes.
I learnt that while watching Lord of Mysteries.

FMA: Brotherhood until the ending when a teenager fist-fights an otherworldy being powered by magic and thousands of dead people.

AOT

• Steins;Gate
• Code Geass
• Solo Leveling
• Demon Slayer
• Black Clover
• Fate (series) - Stay Night / Zero / Grand Order etc.