How do I get better at system integrations and reporting logic?

You use the system well day to day, and still the integrations and the reporting logic trip you up. That is not a sign you have hit your ceiling. Those two areas are harder because they are about how pieces connect and where numbers come from, not just which buttons to press. Reporting logic confuses people because a number on a screen is the end of a chain, and you are only seeing the last link. Integrations confuse people because data is quietly moving between systems in ways no single screen shows. Both get clearer the moment you stop looking at the surface and start tracing the flow. Take one report that has puzzled you and follow a single number all the way back: where it starts, what touches it, how it lands where you see it. Trace one chain fully. Do that a few times and the logic stops being a black box and starts being a map you know.