Concentrating on the Fourth Gospel (so called John), where he consistently rejects the title; it is clear that Jesus ought not to be conceptualized as our King - despite that this title is given him so often at this Christmas time of year.
Instead Jesus is self-described as the Good Shepherd.
Clearly, as The Messiah, many Jews expected Jesus to become a literal King of the nation of Israel. But Jesus states that his 'kingdom' is not 'of this world'; and this is more of a negation of his this-worldly kingship (I am Not what you mean by a King) - than it is an assertion that he will be some other kind of 'a King' in the next world.
Jesus's 'Kingship' of Heaven is not explicitly stated or confirmed elsewhere in the Gospel, yet in the Fourth Gospel, Jesus's core claims and teachings always are repeated; apparently for clarification and to reduce ambiguity.
At most; only a very qualified form of Heavenly Kingship could be regarded as having been claimed by Jesus in the Fourth Gospel.
When asked outright by Pilate 'Art thou a King?' - Jesus replies 'thou sayest'; and indeed Pilate is determined that Jesus be conceptualized as one who claimed the Kingship of the Jews - even going so far as to put this title onto his cross.
But - in the Fourth Gospel - King is not a title claimed or asserted by Jesus; quite the contrary.
In terming Jesus King, we follow Pilate - not Jesus himself.
This also fits with the extended passage in John 15, where Jesus describes the relationship between himself and the disciples as a friendship - and therefore not like King and Subject. Indeed, throughout the Gospel, family (therefore not Kingdom, nor anything formally analogous) is the consistent 'metaphor' (or model) used to describe the kind of world that Jesus wants and promises.
Jesus does not claim to be King, but does state that he is the Good Shepherd.
The difference between King and Shepherd is that a King leads his people on earth; while the Good Shepherd will lead his people to Heaven.
This is important because it makes clear that Jesus's central message was about resurrection to that eternal Heavenly life to which he would lead those who would follow.
Jesus's message was not primarily about setting-up any new kind of kingdom in this world; not even a new kingdom led by Christ as King.
Instead; the core message of Jesus Christ was about leading those who loved and would follow him to another world - beyond death.