Please give me some proof/story to suggest afterlife may be real

I'm currently grieving but holding it together. It's not even the loss as much as being afraid where loved ones that die end up. If only I knew this, I would at least get some closure and deal better with the loss despite everything.

Does anyone there have any proof or suggestion if and why afterlife may be real?

I hate the idea of nothingness after death, it makes me afraid myself

(I'm a Christian but I know our stories are biased in these terms, even though I do and will always believe in God)