  We provide a unified description of the QCD phase diagram across different
energy regimes. Without any adjustable free parameters fitted to lattice or
experimental data, we demonstrate that the net-proton number cumulant ratios
from the Beam Energy Scan-I (BES-I) central ($0-5\%$) Au+Au collision
experiments at RHIC, for center-of-mass energies $\sqrt{s} \geq
39\,\text{GeV}$, are well described by the \textit{dynamical soft-wall} AdS
black hole model, indicating the formation of a strongly coupled quark-gluon
plasma (sQGP). We identify a critical point at \(\mu_B = 247\,\text{MeV}\) or
\(\sqrt{s}=16\,\text{GeV}\) in this model, where net-proton cumulant ratios
show non-monotonic variation. However, for $\sqrt{s} < 39\,\text{GeV}$, the
recent BES-II data does not exhibit the expected variation due to the critical
point, suggesting instead a transition to a nearly-cold ($\mu_B \gg T$) weakly
coupled QGP (wQGP) for $\sqrt{s} < 7.7\,\text{GeV}$. This prediction can be
tested by the upcoming STAR Fixed-Target experimental data.
