Yes you can return your investments from Bitcoin without new investors, if you’re financially literate. Example: You could set up a trust fund with Bitcoin and Dollars in it and pull out your profits from time to time, and the trust’s value wouldn’t be lower than when you started it.
In that case the entity behind the trust fund is a new investor. Try again. Let's me help you. In a banking system you hold units of debt and you benefit when the debt is paid. So, no new investor needed. In a product, you hold intrinsic value and you benefit by satisfying your needs with that value. Again, no new investor needed. In a company you hold shares in capital. Capital produces intrinsic value or is itself intrinsic value, which you also can use for satisfying your needs. So again, no new investor needed. In the bitcoin system you hold units of s system that stores record about how much units in that system you hold. How do you benefit from this without new investors?