I must be honest that these are some pleasant ideas (some of them), yet I'm bewildered that anyone could have any certainty or confidence in them. I understand that many are just giving ideas, not necessarily actual beliefs, yet many people do believe. On the other hand, I once had some similar ideas in which I had belief, though over time as I continued to explore my worldview I became much more skeptical.
I don't believe in a soul, but my worldview is very similar to those who talk about a soul separating from the whole and being absorbed into it again. The whole for me is the universe itself. The elements of which my body is composed are the same elements throughout the universe, and they have been here as long as the universe has. Right now they are composed in such a way as to constitute the human organism that "I" perceive as "myself." Eventually those elements will decompose and merge once again with the universe, and I will no longer have any individuality or mind. I will be one with everything just as before I was born, and yet I'm already one with everything now. We are star stuff, for the stars formed the heavier elements that went on to form ourselves. We are of the earth, the stuff of the universe.
When my body decomposes, my elements will go on, in animals and plants. My actions will live on in the way I have effected others in this "interconnected web of life." If I procreate, part of my genes will live on, genes that are heir to billions of years of evolutionary history.