How can I increase brightness on my macbook above the limit?
According to reviews screen should have the following brightness levels:


MacBook 12" 2017: about 350 cd/m^2
MacBook Pro Retina 13" Late 2013: 330 cd/m^2


So the MacBook 12" should be at least equally bright as your MacBook Pro Retina 13".

You cannot increase the screen's brightness above 100 %. Please contact Apple or your vendor to exchange your MacBook or to repair it.