  The evolution of the critical superconducting temperature and field, quantum
oscillation frequencies and effective mass $m^{*}$ in underdoped
YBa$_2$Cu$_3$O$_{7-\delta}$ (YBCO) crystals ($p$ = 0.11, with $p$ the hole
concentration per Cu atom) points to a partial suppression of the charge orders
with increasing pressure up to 7 GPa, mimicking doping. Application of
pressures up to 25 GPa pushes the sample to the overdoped side of the
superconducting dome. Contrary to other cuprates, or to doping studies on YBCO,
the frequency of the quantum oscillations measured in that pressure range do
not support the picture of a Fermi-surface reconstruction in the overdoped
regime, but possibly point to the existence of a new charge order.
