Professionally, a Sagittarius Sun comes alive wherever there's a big idea and someone to explain it to. Teaching, lectures, training, media, publishing, law, international business, diplomacy, travel, sports coaching, producing, philosophy and theology, psychology held as a worldview. The strongest fit tends to be any role where you have to inspire other people to follow you on a long journey: founder of a school, owner of a course, presenter, director, the coach of a national side. The further their voice carries, the more precisely they seem to understand who they actually are.
It works badly in settings that pay for staying put and staying the same. Endless operations, small recurring reports, a flat schedule with no horizon — that's the ground where a Sagittarius Sun slowly loses themselves: first irritated with colleagues, then with the company, then simply gone. I'd put it this way: they need a long project where the first couple of years are murky and nothing quite makes sense, but where something genuinely large can come of it later. Over a career they nearly always relocate — another country, another city, another industry, sometimes more than once. That's not restlessness for its own sake; it tends to be a way of gathering material.
Money, with this Sun, also tends to behave in line with the rest of the chart: it's often earned around belief and momentum rather than steady accumulation, so project fees, ventures and results-based pay tend to suit better than a flat, unindexed salary. A venture of their own usually pulls at them; the open question is whether they steer the first one through to something stable or drop it at the peak of interest and chase the next big frame. By their forties and fifties, many settle into the role of the person others come to for meaning — for advice, for a frame, for permission to act on a large scale. They tend to carry that role lightly, because in a sense they've spent the whole of life rehearsing for it, even back when they had no idea that was what they were doing.