They are constantly told that Jehovah will provide for them. "Look at the birds of the air; they neither sow nor reap nor gather into barns, and yet your heavenly Father feeds them. Are you not of more value than they?" (Matt 6:6)
In most cases they move back home and rely on family, or the local congregation members (Note: NOT the Congregation) may assist them. That could be assisting them with finding some low paying job for a wealthy brother in business or more likely, assisting them to sign up for government assistance programs. In the US that is Medicaid, SNAP (food stamps), etc