"Solo effort" refers to a task or project that is done by a single person without any help or collaboration from others.
Sentences with «solo effort»
Never forget that objectivity decreases exponentially with increasing solo effort. (sciencemag.org)
The album will be her third solo effort, and is set to be accompanied by a «narrative film project». (nme.com)
The first solo effort by Boris Barnet, Devushka s korobkoy (The Girl with the Hatbox) opened during a pinnacle year for silent cinema. (sensesofcinema.com)