尛爺半生沉浮

This username '尛爺半生沉浮' literally means 'a humble old man’s ups and downs in half a lifetime'. Here, the character '尛爷 (humble old man)' implies oneself who has lived through much like hardships and glory days as expressed by the phrase 'half life of floating and sinking' which is a poetic way of expressing the many vicissitudes of his past. The person may be looking back at their past experiences.