It's strange but I think I have better grounds for believing consciousness will continue now, than I did when I was a believing JW.
Like I have said elsewhere (to general derision and lack of engagement) if existence is comprised purely of material substances and forces, then we are immortal in a sense. The sense being that, if such properties comprise who we are in toto, then the extension or recapitulation of who we are is merely a technical question that will be solved one day. If there is a God then he could already solve it if he wishes. If there is no God then intelligent life will progress to the point where it meets the challenge itself. Either way we face immortality. If materialism is incorrect then that opens up yet more possibilities. But all lead back to immortality.
I understand that death may be the permanent end of consciousness. I don't honestly know how that could be the logical outcome. But I must acknowledge that since my understanding and knowledge are limited, it is possible there is a scenario which I cannot understand or do not have enough knowledge to apprehend.
Conversely the alternative to mortality is also a bit frightening, What does the universe or God have in store for us?