Software isn't an art project; it's a practical tool to solve practical problems.
Some of my more impactful changes haven't been all that complex; it was just a matter of knowing where and when to spend my time, based on working with our customer team, sales team, and directly talking to some customers.
One of my more praised changes was adding a link to our support backend that saved our customer team minutes of manual work every time. This was literally just adding a permalink: 3 minutes of work. Simple and low-complexity? Yes. But also impactful and moved the needle, and no one else had done it in the previous years.