I'd recommend 'Tower of God'. It has an intricate world-building and intense action sequences. The plot is full of surprises and the art style is top-notch. Also, 'Solo Leveling' is a must-read. It has a unique power system and the protagonist's growth is really engaging.
'Naruto'. It has a long and completed story. Naruto Uzumaki starts as an outcast in his village but grows into a powerful ninja. The action scenes are amazing, with different jutsus (ninja techniques) and epic battles against powerful foes.