GTO is an orbit which has its main axis in the plane of Earth's equator. Moon orbit has a different plane. This means until GTO main axis isn't on the intersection of equator and Moon orbit, you can't get to the vicinity of the Moon by just raising apogee. Raising apogee won't change the direction of the main axis of the orbit, and that axis doesn't in general lay in the Moon orbit plane.
So how Beresheet is going to get to the Moon starting from GTO and having modest delta-V capabilities?