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The quasi-one-dimensional (q1D) material Rb$_2$Mo$_6$Se$_6$ has been proposedto display a nontrivial combination of low-dimensional fluctuations and adynamical charge density wave (CDW) at ambient pressure. This may lead to aprogressive metal to insulator cross over at low temperature. To explore thelink between the crystal dimensionality and this insulating instability, wehave performed hydrostatic pressure-dependent electrical transport measurementson single crystals of Rb$_2$Mo$_6$Se$_6$. At low pressure, we observethermally-activated behaviour consistent with a temperature-dependent gap$E_g(T)$ opening below a characteristic temperature $T_{Rmin}$. Upon increasingthe pressure $T_{Rmin}$ initially rises, indicating a reinforcement of the lowtemperature insulating state despite a continuous reduction in $E_g(P)$. Weinterpret this as a signature of suppressed fluctuations as the dimensionalityof the electronic structure rises. However, $T_{Rmin}$ drops above 8.8 GPa andsuperconductivity emerges at 12 GPa. Between 12-24.2 GPa the superconductingand insulating instabilities coexist, with superconductivity surviving up tothe maximum attained pressure (52.8 GPa). Analysis of the magneto-transportreveals two distinct regions: at high pressures the anisotropy gradually fallsand the superconducting state appears unremarkable. In contrast, coexistencewith the gapped insulating phase creates a superconducting dome. The emergenceof a peak in the critical temperature Tc despite the depleted density of statesis indicative of enhanced coupling. Our journey from the extreme 1D to 3Dlimits in this prototypical q1D metal reveals an intriguing relationshipbetween superconducting and insulating ground states which is simultaneouslycompetitive and symbiotic.

Fluctuation, insulation and superconductivity: the pressure-dependent phase-diagram of Rb$_2$Mo$_6$Se$_6$