Unused things beget other unused things.
For example, you might have a form that’s required for taking time off at work. That form might then be processed by someone in another department within the company and entered into a database.
If you realize that the form isn’t necessary to request time off, you have to get rid of it then before you’ll realize that you don’t need someone typing them into a database. And then once that’s all gone, you might realize that you no longer need the database.
Be patient and ever vigilant to remove things that aren’t needed, they tend to uncover other unnecessary things and in enough time tend to have an exponential impact.
Don’t strive for a quick win, instead be ready for the long haul.