When your mind and heart are truly open abundance will flow to you effortlessly and easily.
“What happens after we reunite with our source and merge with the Oneness?”
The thing about connecting to our source is that we fully step into present awareness which is beyond time.
There is no before or after in that state of consciousness.
So even if you are talking about what happens to that awakened consciousness after a body dies, the answer is the same.
That enlightened awareness has no history or future in or out of a body, it simply is.
Existence recognizes what it has always been.