You can’t remove officials for not fulfilling their promises. They can also delay until it’s too late by saying, “I’m working on it.” Then once out of office, they are accountable for nothing.
Job safety is built into the position for good reason. However, it’s been perverted to allow officials to do whatever they want. Fixing this balance is not simple, but I believe would be a crucial step towards realizing a functional democratic system.
I am thinking that a "promise" is not a quantitative term. It needs to be ratified into specific data oriented actions that can go through a litmus test whether it was fulfilled or betrayed.
After that, one idea is to have an accountability score tracked by bureaucracy and have that printed on the ballot along with their principle accomplishments in the supplement. Another idea is to have a penalty score of not meeting prior promises as a dilution factor to the number of votes. If a politician only met 90% of the promises, they will lose 10% of the voting power of the public (like a 0.X multiplier to the votes). Just thinking out loud, there may be major issues with these ideas.
But now you'll get an unstable system where candidates get kicked out all the time and are too populist because they don't expect to live long.
So add a low-pass filter. When the moving average of the candidate's support falls below the threshold and a definite other candidate's support is high enough, replace the incumbent with that challenger.
You might even increase the duration of the moving average with time, like the doubling trick in multi-armed bandits. The logic is that a candidate who has shown that he can weather the initial period without getting voted out can be trusted with more long-term decisions, i.e. actions speak louder than words.
Switzerland, people can always overrule politicians decisions there, no need to wait until next election. This means that the opinions of politicians is no longer as important so this issue doesn't even come up. So you place more value on finding the politician best fit for running the country, not the politician with values most aligned to your own.
Unrelated side note: when you are talking about a hypothetical politician, be aware of your choice of pronoun.
You might be the type of person who picks between he/she with a precise 50/50 split but I'm going to assume you are not that type of person. Similar to the way you seem to have assumed that if a person is a politician they are also a man.
Next ammendment: direct election of cabinet members.
Also, all changes to policies to be parameterized and adiabatic.
I guess some of that bleeds through: that I use "he" without reflecting on it because it wouldn't carry an implication of actual gender in my first language. I am definitely not assuming that politics is a men's only club.
"No heat, only work". I like that proposal :-)