You're not in the universe at all, but rather, you are the universe expressing itself as you.
Oneness isn't a place you visit through meditation or ego death — it's the fact that there was never a boundary to cross in the first place. We speak of being "in" the world as if the self were a passenger riding inside something vast and separate, but a wave is not in the ocean; it is the ocean briefly taking a shape. The same way a galaxy can fit inside a droplet and a strand of mycelium can echo the cosmic web, the line between you and everything is a trick of scale, not a truth of substance. We are not fragments looking for the whole; we are the whole, momentarily arranged into a point of view. What changes if the universe is not your home but your activity?