Not a career, a position on something
It is not really a career. It is a stance you have taken, which happens to be paid. Pluto in Sagittarius in the 10th house puts the search for meaning into your public role, so a job that asks you to have no view is not a job you can hold.
The Sagittarius half of this is collective. Pluto marks a long run of birth years with the same restlessness about meaning, and it describes a period rather than an individual. The 10th house is the personal half, fixed by your birth time. It aims the searching at your standing and your work, which is why every professional decision you have made has been about what it stood for as much as what it paid.
Representing something you reject
On being publicly associated with something you do not believe. You can tolerate difficulty, low pay and long hours; you cannot tolerate representing a position you privately reject. That is not idealism, it is a structural limit. It explains every abrupt departure in your record, including the ones you have described to yourself differently.
All in, then gone, with no middle
Total commitment to a role followed by complete departure from it, with nothing gradual available in between and no adjustment short of leaving. While you are inside one it feels definitive every time. Note down at the start of each what you believed you were joining, since the note is the only thing that will let you see the shape later and you have never made one.
What people meet in your position
They meet somebody with conviction and a visible unwillingness to be managed, which is compelling and slightly alarming to anybody responsible for you. Some organisations will pay a great deal for that and some cannot house it at all. Establish which kind you are joining before you accept, since you have made that mistake more than once.
A public stance that can hold for years
Taking a position is easy for you and maintaining it through the boring middle years is not, and standing is built almost entirely out of the middle years. Choose one thing you would still argue for when it is no longer interesting, and stay with it, since a stance that has never been maintained under tedium has not really been tested.
Known for where you stand
In your field people can state your position on the main questions without having to ask you, which gives you influence and makes you difficult to place in any room where flexibility is required. That is a trade you have made repeatedly. Decide whether you would make it again, since it has been decided by temperament rather than by choice.
What you do was not on their list
The working life you chose was not among the options your relatives recognised, and neither side has ever properly discussed what that meant. They formed a view and you assumed you knew it. Ask what they actually thought at the time, since a forty-year-old assumption has been shaping how much of yourself you bring home.
Two years is your natural term
Look at your record and the interval is remarkably consistent: about two years in anything that does not answer a question you actually hold, regardless of pay, title or how sensible the position looked at the start. Nobody has ever named the pattern to you. Take the interval seriously as data when you next accept something, since it has predicted every departure you have made.
You will not be bought into silence
There is a figure at which most people would agree to represent something they do not believe, and you have discovered that yours does not exist, which is expensive and genuinely rare. It has cost you at least one substantial opportunity. Count what the principle has been worth in both directions once, so it stays a choice rather than becoming a reflex.
The flat period after the project ends
You run at full commitment while something means something and then drop into a stretch of genuine flatness once it finishes, and you have been reading the flatness as a personal failing for years. It is the other half of the same rhythm. Plan the landing before the project ends, since afterwards you will not have the energy to arrange one.