[en] We present a high-pressure study of van der Waals ferromagnetic metal Fe₃GeTe₂ through electrical transport and Raman scattering measurements in diamond anvil cells at pressures up to 22.4GPa. Upon compression, the ferromagnetic transition temperature T _c manifested by a kink in resistance curve decreases monotonically and becomes undiscernable around P _c = 10GPa, indicative of suppression of the itinerant ferromagnetism. Meanwhile, by fitting the low temperature resistance to the Fermi liquid behavior of R = R ₀ + AT ², we found that R ₀ shows a cusp-like anomaly and the coefficient A diverges around P _c. These transport anomalies imply a tricritical point as commonly observed in itinerant ferromagnets under pressure. Unexpectedly, the Raman-active E _2g and A _1g modes soften remarkably after an initial weak hardening and the peak widths of both modes broaden evidently on approaching P _c, followed by complete disappearance of both modes above this critical pressure. A possible underlying mechanism for such anomalous lattice softening near P _c is discussed. (paper)