In the New Testament; Jesus is sometimes referred to as the Son of God, other times as the Son of man - and the meaning and difference has been hard to define.
However, if the Fourth ('John's') Gospel is taken as the primary and authoritative Gospel and source of knowledge about Jesus, and if we consider Jesus as living in linear-sequential Time (so that 'before' and 'after' make a real difference in ultimate reality); then the usage of 'God' and 'man' is seen to be consistent - and potentially enlightening.
In sum, Jesus was born as a Son of God, but became the Son of man after he was resurrected - and it was the Son of man who ascended to Heaven.
The Chapter and Verse references (according to my Kindle search facility for the Gospel of John in the King James Bible) are as follows:
'Son of God': 1:3; 1:49; 3:18; 5:25; 9:35; 10:36; 11:4; 11:27; 19:7; 20:31.
These all refer to the mortal Jesus, during his earthly ministry and before his resurrection - but seem to include the period after his death and before his resurrection when, in 5:25 it says 'The hour is coming, and now is, when the dead shall hear the voice of the Son of God; and they that hear shall live.' Presumably this refers to 'the harrowing of Hell' - or more accurately (since Hell did not exist until after the ascension) the ministry of Christ to the souls in Sheol.
The references for 'Son of man' are: 2:11; 3:13-14; 5:27; 6:27; 6:53; 6:62; 8:28; 12:23; 12:34; 13:31.
These refer to the resurrected and, especially, to the resurrected-ascending Christ.
The 'switch' from naming Jesus the Son of God to the Son of man, gives us important knowledge of Christ's mission - why it was necessary for him to be incarnated, die and be resurrected. Before incarnation, Jesus was already a Son of God, and was 'maker' of everything that-had-been-made (which, I take it, does not include Men).
But the Son of God could not save Men, could not offer us life everlasting; that entailed Jesus becoming the Son of man - that state of having-died as a Man, and then been resurrected to eternal life.
Jesus as Son of man was a higher being than when he was referred to as the Son of God: it is the Son of man who is our Saviour.
