A more peaceful mind free from craving and distraction is of immense benefit in discerning your situation.
Just be careful that it's not a new sticky concept of oneness as opposed to the old concept of separateness.
I know my mind at least can pull a self rabbit out of any hat.
Ideas of self versus ideas of not-self can share the characteristics and effects of any idea and grasping, no matter the actual "flavor" or content.
That said, I think oneness is a lot more skillful of a tool than separateness.
It doesn't reinforce the same old me/you, this/that dichotomy that we've practiced our whole lives and that causes so much isolation and suffering.
Oneness can also be a good backdrop to notice these separating habits, especially regarding aversion and thoughts/circumstances you don't want.
That said, I'd recommend a quick search of the forum for "monism".
Some people much smarter than I have discussed the idea.
It may help you discern a middle path between "all is one" (monism) and "all is two" (what we're most familiar with).
Please take the above post with a grain of salt.