Everything is one. I'm God. I have many eyes, and for an interesting experience I look through microscopes with my countless number of eyes. When I look in this way, each of my eyes is felt as a separate individual, going through its own experience. We are here - these eyes. When we stop looking through a microscope (when we leave this life) - we understand who we really are.
This material world in which we find ourselves is simply an artificially created simulator, a matrix that is needed for our development. Nothing happens here that we don't need. There are certain rules here that are needed for our development. This material world is simply a matrix for cultivating our best qualities (kindness, wisdom, responsibility, conscience, etc.). We come into this series of reincarnations from the most elementary particles, then we move into minerals, then into plants, then into animals, then into people. And we are leaving this series of reincarnations already as intelligent spiritual beings (because before that we didn't have all the qualities that we acquired here).
In short, each of us has their own goals specifically at the level of development at which each of us is. But if to generalize, then we just need to conscientiously fulfill our duties (for example, you feel that you need to do it in a certain way, because it will be right, then you need to do it, overcome laziness in yourself, etc. so you will cultivate the necessary qualities).