 This study proposes a theoretical approach to efficiently generate extreme ultraviolet isolated attosecond pulses, IAPs, at multi-MHZ repetition rates using cavity-enhanced high-harmonic generation, HHG. The authors identify polarization gating and a new method, employing non-colinear optical gating in a tailored transverse cavity mode, as suitable candidates for generating IAPs. They show that the transverse mode gating, TMG, method has the potential to generate IAPs with photon energies around zero EV and a photon flux of at least eight photons s, one at repetition rates of 0 MHz and higher, which could significantly decrease measurement time in photoelectron spectroscopy and microscopy. The study also paves the way for combining attosecond streaking with photoelectron emission microscopy and generating frequency combs with an unprecedented bandwidth for ex-UV precision spectroscopy. This article was authored by M. Hockner, V. Tosa and I. Pupazer. We are article.tv, links in the description below.