What title did jesus most frequently use to reference himself?

son of man  

Explanation:

Example of this would is written in Revelation 1:12-13 . By referring himself as a common man  Jesus wants to set an example to The people who follow Him and his teaching. (So it become more relatable)

If he placed himself as God among the followers, most of them would most likely think that it is impossible for them to actually embodied the teaching