What if the Universe is a sphere?
What if "Constant Expansion" is just this Sphere moving around itself, like ink moving around a drop of water?
That'll mean there's "an infinite Expansion" that is in reality, static and equal across all dimensions.
If things adopts round shapes to conserve energy, what's preventing the idea of Cosmos/Universe from taking this round shape in which every point across surface is a literal limit, with infinite Expansion in appearence relative to us?
The Big-Bang that came out of nothing, then it becomes an analogous phenomenon of creation and existence just like an atomic bomb forms a mushroom cloud, except, in my idea, instead of Universe dissipating as a cloud, it just... it just wraps around itself, giving the illusion of "Boundless Universe yet Limit of Visible Universe".
Another analogy, is as if someone in the Empire State looked at the horizon with the illusion of flatness when in reality Earth is "a balloon" that, on scale is "infinite" across all points due to point of view and relative travel speed. Like a ship drifting on an open wide ocean and only moving at any point across the ocean wrapping the Earth's mantle.
Another simplified analogy:
The Universe is a 3D Spherical Shape.
Earth and any object within is a 2D Plane wrapped into a sphere.
Since we're small in scale relative to size of Universe, we think it's "limitless" due to our moving speed. Like a speck of dust trying to do a 360° turn on Earth.