If you liked
Dragon Ball Gaiden: Tensei shitara Yamcha Datta Ken
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...then you might like
Baki Gaiden: Retsu Kaiou wa Isekai Tensei shitemo Ikkou ni Kamawan!
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Both of these are Isekai parodies of longrunning shounen, both are about playing with the series' rules in ways the source material never could.
If you liked
Shinseiki Evangelion
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...then you might like
Eden: It's an Endless World!
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Has similar religious themes, focuses on flawed characters, and has an ethereal ending focused on the human condition.
If you liked
Battle Royale
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...then you might like
Liar Game
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Both focus on strategic battles and a prisoner's dilemma-esque situation. Battle Royale is more action oriented, while Liar Game is nearly entirely mental.
If you liked
One Piece
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...then you might like
Kuroshitsuji
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Both are fairly lighthearted. They also are structured similarly, with a larger overarching story complimented by smaller substories.
If you liked
D.Gray-man
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...then you might like
Fullmetal Alchemist
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Both have very similar approaches to worldbuilding and similar protagonists. The opening chapters of both are especially similar.
If you liked
Berserk
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...then you might like
Chainsaw Man
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Both are about a troubled young man coming to grips with their trauma and learning to live life. Both have very interesting antagonists with a personal relationship with the protagonists, and both are extremely gory and have incredible art.
If you liked
Hunter x Hunter (2011)
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...then you might like
JoJo no Kimyou na Bouken Part 5: Ougon no Kaze
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Both have great battles and interesting villains that often outshine the protagonists.
If you liked
Mob Psycho 100
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...then you might like
Cike Wu Liuqi
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Both are action comedy series with psychic protagonists who have mentors that kind of scam them. Both also have pretty neat and beautiful animation.
If you liked
Death Note
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...then you might like
Yakusoku no Neverland
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Both series are shonen filled with mind games and dark scenes. The first arc of The Promised Neverland is especially like Death Note, as later parts have more action.
If you liked
Rurouni Kenshin: Meiji Kenkaku Romantan
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...then you might like
Trigun
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Both Trigun and its sequel series are very similar to Rurouni Kenshin. The two series have pacifist protagonists, and start out as a comedic action series until becoming more serious.
If you liked
JoJo no Kimyou na Bouken (TV)
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...then you might like
Dorohedoro
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Both series are filled with insane yet fun moments and a magic system with each person having unique powers.