This study proposes a multilayer strategy and topology optimization technique to design lattice metamaterials, aiming to fully exploit the advantages of different structural archetypes (beam-, plate-, and shell-based lattices). The multilayer strategy expands the design space by scaling, transforming, or hybridizing single-layer elements, while topology optimization optimizes the material distribution to achieve better mechanical performance. The optimized designs, which combine beam, plate, and shell elements, exhibit ultrahigh stiffness and improved energy absorption under large geometrical deformations. The method also introduces tunable dimensions such as shape, thickness, and area fraction, enabling the design of materials with isotropic elasticity and functionally graded stiffness. Additionally, the multilayer strategy and topology optimization have potential applications in acoustic tuning, electrostatic shielding, and fluid field tuning. Numerical simulations and physical experiments validate the effectiveness of the proposed approach, demonstrating significant improvements in mechanical properties and energy absorption.This study proposes a multilayer strategy and topology optimization technique to design lattice metamaterials, aiming to fully exploit the advantages of different structural archetypes (beam-, plate-, and shell-based lattices). The multilayer strategy expands the design space by scaling, transforming, or hybridizing single-layer elements, while topology optimization optimizes the material distribution to achieve better mechanical performance. The optimized designs, which combine beam, plate, and shell elements, exhibit ultrahigh stiffness and improved energy absorption under large geometrical deformations. The method also introduces tunable dimensions such as shape, thickness, and area fraction, enabling the design of materials with isotropic elasticity and functionally graded stiffness. Additionally, the multilayer strategy and topology optimization have potential applications in acoustic tuning, electrostatic shielding, and fluid field tuning. Numerical simulations and physical experiments validate the effectiveness of the proposed approach, demonstrating significant improvements in mechanical properties and energy absorption.