  Superconductivity emerges from the spatial coherence of a macroscopic
condensate of Cooper pairs. Increasingly strong binding and localization of
electrons into these pairs compromises the condensate's phase stiffness,
thereby limiting critical temperatures -- a phenomenon known as the BCS-BEC
crossover in lattice systems. In this study, we demonstrate enhanced
superconductivity in a multiorbital model of alkali-doped fullerides
(A$_3$C$_{60}$) that goes beyond the limits of the lattice BCS-BEC crossover.
We identify that the interplay of strong correlations and multiorbital effects
results in a localized superconducting state characterized by a short coherence
length but robust stiffness and a domeless rise in critical temperature with
increasing pairing interaction. To derive these insights, we introduce a new
theoretical framework allowing us to calculate the fundamental length scales of
superconductors, namely the coherence length ($\xi_0$) and the London
penetration depth ($\lambda_{\mathrm{L}}$), even in presence of strong electron
correlations.
