If you liked
Gyakkyou Burai Kaiji: Ultimate Survivor
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...then you might like
Tomodachi Game
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Involves smart main characters who are dragged into high stakes games to pay off their debt. Both are pretty much the same except Tomodachi Game is like a newer version of Kaiji.
If you liked
Tokyo Ghoul
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...then you might like
Kiseijuu: Sei no Kakuritsu
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Parasytes and Ghouls are quite the same. Parayste is more philosophical and realistic where Tokyo Ghoul is more action-shounen based. Main characters undergo a physical chabge which boosts their powers but also changss their mentality and becomes less human.
If you liked
Dororo
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...then you might like
Kimetsu no Yaiba
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Demons and supernatural abilities. Main character loses something and slays demons in order to achieve his goal. Premises are very similar, as well as the concept of demons.
If you liked
Prison School
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...then you might like
Grand Blue
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Extremely funny and adult jokes. Both are school themed (one is a high school and other is university). It's a comedy show so if you like either of these, then you'll definitely like the other.
If you liked
Bakemonogatari
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...then you might like
Yahari Ore no Seishun Love Comedy wa Machigatteiru.
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Both series are essentially the same except Bake has supernatural elements. Both protagonists are similar in terms of character and even their thinking and views are the same. Yukino and Senjougahara are also really similar.
If you liked
Koe no Katachi
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...then you might like
Kimi no Suizou wo Tabetai
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Both are dramas with a romantic subtext and a character with a disability. The main male characters are socially awkward but unintentionally makes a connection with a female character. Both moviss are really unique and sad. It tells you of people's struggles and the value of life.
If you liked
Re:Zero kara Hajimeru Isekai Seikatsu
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...then you might like
Mushoku Tensei: Isekai Ittara Honki Dasu
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Both are isekai but different from others. Both main characters are unlikeable at first but they develop as ths series goes. Both shows have some form of realism which is unlike most isekai. Amazing worldbuilding and characters, great music as well. Technically produced by the same studio (White Fox).
If you liked
Steins;Gate
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...then you might like
Re:Zero kara Hajimeru Isekai Seikatsu
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Adapted by the same studio, similar time-travel mechanism. Both the protagonists; Okabe and Subaru are stuck in a loop and face many obstacle from saving their loved ones. Using knowledge from previous loops. he is able to go further.
If you liked
Bleach
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...then you might like
Kimetsu no Yaiba
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Both have very similar premises and appeal. Elite warrior organizations training to face off against supernatural beings which average humans being powerless against. Both have a similar fighting style (using swords) and set up ranks and titles. Both of these are amazing shonens with good fights and great animation.