How can this goal be achieved?
From a user experience (UX) perspective, every available process must be captured and analyzed. A direct comparison of these processes reveals the differences, which can consequently be eliminated. Processes are standardized.
From a user interface (UI) perspective, this requires, for example, uniform sizes of buttons, text inputs, font sizes and of course colours as well as icons. The list of components should be as long as it is useful for the tool.
Building on existing systems is recommended, because the wheel does not have to be constantly reinvented. The most common patterns, which the users already know, are usually the most popular because they are understood and not questioned.
An important point: A design system should not be created once and have its validity for all eternity. Working with such a system is an iterative process: it must be possible to replace outdated solutions and there needs to be room for new approaches.