Undocumented students without work authorization cannot legally be employed. But they can pursue income-generating opportunities through:
Starting their own business
Independent contracting
Use filters on sites like LinkedIn and Indeed
Freelance websites: Fiverr, Upwork
Certain fellowships without immigration restrictions
State or campus work study programs (varies by state/institution)
https://www.nysylc.org/getpaid
(Free Virtual Job Simulations)
https://www.theforage.com/