This person tends to need work with a horizon built into it. An office from nine to six, the same tasks on a loop, a narrow specialist niche — those dry them out quickly. The roles that suit tend to carry movement, learning and contact with other cultures and other people. I often see Venus in Sagittarius in university lecturers, in coaches, in people working at the upper end of travel and hospitality, in publishers, and in those who spend their days inside international teams. The common thread is that the work itself keeps widening the view rather than narrowing it.
One especially strong line runs through everything to do with teaching adults. Venus here tends to have a gift for packaging difficult knowledge attractively — making it feel wanted, almost contagious. That can take the shape of courses, talks, curated journeys, mentoring. The financial return more often arrives not on the first attempt but after the person has built genuine standing in a niche, which in my experience tends to be something like five to seven years from the start rather than the first season.
If the work is employed rather than self-directed, this kind of person tends to feel best where there are work trips, documents to translate, negotiations with partners abroad, projects sitting on the seam between countries. A static "do this one thing forever" seat is borne badly: even on a good salary, a background restlessness tends to surface within a year or two, and the person starts looking for the way out. I'd suggest that someone with this placement choose, from the outset, a line of work where growth and expansion are baked into the job itself — rather than something they have to keep prising out of a manager. As with everything here, that's an observation to test against your own life, offered for reflection and a little fun.