Let me suggest two alternative approaches to this question, third person and first person. The third person response would be define “consciousness” with respect to some logical construct or observed phenomena, either of which should be accessible to anyone. The first person approach would be to give a description of feelings, perceptions, experiences, etc. that find expression with the term “consciousness”. Then maybe try to understand how such feelings, perceptions, experiences, etc. arise.
It’s hard for me to get excited about this or that third person definition of consciousness, unless it connects back directly to something experienced in the first person.