  The shrinking of the bottomonium spectral function towards narrow
quasi-particle states in a cooling strong-interaction medium at finite baryon
density is followed within a holographic bottom-up model. The 5-dimensional
Einstein-dilaton-Maxwell background is adjusted to lattice-QCD results of sound
velocity and susceptibilities. The zero-temperature bottomonium spectral
function is adjusted to experimental $\Upsilon$ ground-state mass and first
radial excitations. At baryo-chemical potential $\mu_B = 0$, these two pillars
let emerge the narrow quasi-particle state of the $\Upsilon$ ground state at a
temperature of about 150 MeV. Excited states are consecutively formed at lower
temperatures by about 10 (20) MeV for the $2S$ ($3S$) vector states. The baryon
density, i.e. $\mu_B > 0$, pulls that formation pattern to lower temperatures.
At $\mu_B =$ 200 MeV, we find a shift by about 15 MeV.
