<jats:title>Abstract</jats:title><jats:p>Increasing the upper critical field <jats:italic>H</jats:italic><jats:sub>c2</jats:sub> in superconductors is one of the most significant requirements for superconducting applications. Two-dimensional (2D) noncentrosymmetric NbSe<jats:sub>2</jats:sub> is a promising candidate because its pair breaking is protected by the spin-momentum locking effect, resulting in a giant in-plane <jats:italic>H</jats:italic><jats:sub>c2</jats:sub> (~50 T). However, the strong anisotropy of 2D NbSe<jats:sub>2</jats:sub> suppresses the robustness of out-of-plane <jats:italic>H</jats:italic><jats:sub>c2</jats:sub> (<5 T). To overcome this issue, we propose a synthetic approach to produce superconducting NbSe<jats:sub>2</jats:sub> films with a nearly isotropic large <jats:italic>H</jats:italic><jats:sub>c2</jats:sub>. Scalable selenization methods are tailored to create 3D superconducting networks in which 2D NbSe<jats:sub>2</jats:sub> flakes are vertically aligned to the substrates. The angle-resolved magneto-transports reveal enhanced <jats:italic>H</jats:italic><jats:sub>c2</jats:sub> values that exceed 20 T for arbitrary directions under externally applied magnetic fields. The isotropic nature of <jats:italic>H</jats:italic><jats:sub>c2</jats:sub> is attributed to the averaging intrinsic anisotropy of NbSe<jats:sub>2</jats:sub> through 3D structured films, which was determined by X-ray diffraction measurements. The proposed synthetic approach will provide a new method for creating practical superconductors that are robust against magnetic fields.</jats:p>
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