 If you liked Nanatsu no Taizai |  ...then you might like Kimetsu no Yaiba |
I have seen just another person recommend Nanatsu no Taizai and I think it's unfair because their both great animes. Very similar indeed, both being about some knights/slayers hunting demons and wanting to save their loved ones. The MCs are kinda relatable to each other, both being small, friendly, OP when needed characters.
They are both terrific anime with memorable fight scenes and set in medieval - like worlds.
- Both anime follow a diverse cast, each with there own quirk who work together to achieve a common goal and fight against Demons - Also each character has their own tragic backstory - Both series are shonen which show how the characters progress and grow stronger. -Good Action and visuals too