the.com/forest for the trees

means Being so absorbed in small details that you fail to perceive the larger pattern or situation they form.

from From the proverb 'can't see the forest for the trees,' recorded in English since at least the 1500s. The image is plain and visual: stand close enough among individual trunks and leaves, and the whole woodland — the forest as a single shape — disappears from view. The phrase has stayed almost unchanged for centuries because the picture it paints needs no updating; close-up attention has always had a way of crowding out the big picture.