Changing your sitting / standing arrangement can also be a good context switch where you give yourself a context-switch around your physical workspace. It can be as simple as just standing up and stretching from time to time, or as complex as raising or lowering your standing desk. Telling yourself that there are two contexts around your desk: sitting and standing at the desk, may be enough to give yourself the context switch and rest that your mind needs.
Changing your sitting / standing arrangement can also be a good context switch where you give yourself a context-switch around your physical workspace. It can be as simple as just standing up and stretching from time to time, or as complex as raising or lowering your standing desk. Telling yourself that there are two contexts around your desk: sitting and standing at the desk, may be enough to give yourself the context switch and rest that your mind needs.