The 'voice' anybody has is some function of their capital, ability to leverage it and ability to prevent its erosion by theft, fraud, seduction/politics scams and honeytrapping. Humans can still acquire capital in the future in several ways, although their ability to not be parted from it is in doubt.

1: verbal/literary labour with your vocal cords, or the use of an output tool, to playback existing or newly created works in environments where mechanical methods are disallowed or disfavored,

2: aesthetic labour through precise recreations of other's mental labour in the performing arts,

3: legal labour in acting as an agent to help or hinder existing legal processes in systems that give humans standing,

4: biological labour as a substrate for growing certain transplantable products,

5: smuggling labour (either non-invasive or surgically invasive),

6: political labour to incrementally sway electoral results in any polity where you are still enfranchised,

7: security labour as a canary for infohazards (such as 'diplomat' programs produced by another ASI) inside of a quarantined environment,

8: frontman work as a deniable patsy to enable economic forgery, deception, revenge or warfare by some hypergraph of patron AGIs and the superorganisms they compose with, or without, your knowledge of what your work entails.

Some of these have a strong factor of supply and demand. You can increase your market value by reducing the supply of other humans competing for these revenue sources.

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