undertaking (n.)
Something undertaken : ENTERPRISE m-w
The restoration of the old theater is a huge undertaking.
A task that is taken on; an enterprise. Lexico
undertake (v.)
To take upon oneself: set about: ATTEMPT
undertake a task
undertake to learn to swim m-w
Commit oneself to and begin (an enterprise or responsibility); take
on.
A firm of builders undertook the construction work. Lexico
Autonomous activity implies a goal toward which it is directed or an
undertaking of which it is a part.
...
Ms. Jones, for example, may autonomously undertake to learn to play the piano. Charles Lidz;
The Erosion of Autonomy in Long-Term Care
One of the best early tasks you can undertake to improve your
journal article is to write an abstract—something that describes your
article's topic and argument. Wendy Belcher; Writing Your Journal
Article in Twelve Weeks
A travel piece about all of New York City might seem like a big
undertaking because it is. Kerrie Flanagan; Writer's Digest Guide to Magazine Article Writing
"I know what you can do," she said. "You can write your own songs.
Everyone does it...They'll jump at the idea of their lead singer
writing her own stuff..."
...
"I don't know," she said doubtfully.
"It's a big undertaking, a big risk..." Nicholas O'Hare;
Fly!
Most kids need short, attainable goals to keep them interested in the
big picture, and they need some immediate success to keep them
positive about learning new skills.
The best chance for success
with any large undertaking is to breakdown big projects into
small, manageable blocks with a definite beginning and ending. For
music lessons, agree with your child to commit to five lessons—and
accompanying practice session—at a time. L. Berkenkamp and S. Atkins;
Because I Said So!
Undertaking appears to have a broad scope, between simpler tasks and larger enterprises. It can also be used as a verb, undertake, an advantage over some of its synonyms.