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Can't tell your tastes so I'm just going to throw you shows I liked that aren't too niche
-"Monster" if you want a mature mystery thriller
-"Yu Yu Hakusho" is just a really fun shonen romp, the dub is genuinely good despite being cheesy. Its an easy watch at least but its definitely worth watching
-"Casshern Sins" if a thought-provoking mix of action and atmosphere sounds interesting to you
-"Full Metal Alchemist Brotherhood" if you haven't seen it yet
-"Legend of Galactic Heroes" if you take a glance at its artwork and it makes you think "yep, I wanna watch that"
-"Kaiji" is a gambling thriller that'll keep your asscheeks clenched for its full run
-"Boogiepop Phantom" for a genuinely creepy/atmospheric anime. The old one though, the new one sucks
-"Shigurui" bizarre and brutal
-"Now and then, here and there", basically an isekai where absolutely everything gets wrong. really intense show
You already have Ping Pong and I'd suggest you watch that. Probably the most well-paced show I've ever watched, you'll complete it in a day or two