  The potential spin-triplet heavy-fermion superconductor UTe$_2$ exhibits
signatures of multiple distinct superconducting phases. For field aligned along
the $b$ axis, a metamagnetic transition occurs at $\mu_0
H_\mathrm{m}\approx35\,$T. It is associated with magnetic fluctuations that may
be beneficial for the field-reinforced superconductivity surviving up to
$H_\mathrm{m}$. Once the field is tilted away from the $b$ towards the $c$
axis, a reentrant superconducting phase emerges just above $H_\mathrm{m}$. In
order to better understand this remarkably field-resistant superconducting
phase, we conducted magnetic-torque and magnetotransport measurements in pulsed
magnetic fields. We determine the record-breaking upper critical field of
$\mu_0 H_\mathrm{c2}\approx 73\,$T and its evolution with angle. Furthermore,
the normal-state Hall effect experiences a drastic suppression indicative of a
reduced band polarization above $H_\mathrm{m}$ in the angular range around
$30^\circ$ caused by a partial compensation between the applied field and an
exchange field. This promotes the Jaccarino-Peter effect as a likely mechanism
for the reentrant superconductivity above $H_\mathrm{m}$.
