Total Recommendations: 2
If you liked
Yakusoku no Neverland
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...then you might like
Bastard
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They're both filled with horror and suspense at the start, with the main villains of both honestly being terrifying. However, whereas The Promised Neverland sort of overstays its welcome, Bastard is relatively short and can easily be knocked out in a day. One main difference is that the main character of Bastard is much more like Ray, so it might also be nice to read it just to see what he would have looked like if he wasn't criminally underused.
If you liked
Vinland Saga
|
...then you might like
Shingeki no Kyojin: The Final Season
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Both are darker shows with great action and character development. They both have many characters that are morally grey and overpowered madmen too. All in all, these are both classics worth watching.