I think what you are missing is that wealth is actually just "motivation to do work" in quantifiable pieces (we call it "currency", and mark-to-market assets for convenience).

If I could bake a muffin that would make you effortlessly glide through, say, a full day of perfectly laying bricks without taking a break, a warehouse of those muffins would mean I'm extremely wealthy. No money, markets, or currency necessary. It's the purified extract of wealth.

With that in mind, you can see that there is still huge room for more wealth creation. The majority of humans are still doing work that doesn't motivate much work from other humans.

this sounds like a weirdo version of the labor theory of value that youve come up with on your own