ل is articulated by the forward sides/front of the tongue against the corresponding upper gum region. The tongue touches above while the sound finds its characteristic path.
Pronounce lam distinctly in لَهُ. Shifting the contact carelessly can obscure the identity of the letter.
Compare it with ن and ر: all involve the front tongue region, but they do not have precisely the same point or manner. Begin with أَلْ to feel the forward contact.