Former Brother
What alternative are you looking for.
We have all asked the same questions when we left the Borg, but we have all come up with different answers. It is not up to anyone else here to tell you what you should believe or if you should join another religion.
I know when we were in the borg we had a manufactured "one size fits all" answer for everything, but we were living a fairytale that was a lie.
I left the borg 25 years ago and am still asking, I have changed what I believe in over time, life is a journey to be lived.
What I know for sure, we can debate different subjects, and go round and round in circles, but in the end, we can only do what feels right in our own heart, minds. God and given us our own conscience to guide us and we should follow this as it is always right. Live life to the fullest and enjoy each and every single day. We can find happiness in the smallest of things, this can include just smiling at someone passing by and just being thankful.
We have no control of what happens when we die so we have to leave this in God's hand.
Take Care I'm now a Freesoul