How does one decide on what to create next when three people have made three separate requests?

Since I develop alone, all feature requests come to me with equal weight. In the past week, I received three: dark mode, CSV export, and Slack integration.

So far, my way has been to develop whatever the nicest user wanted. Bad system, obviously. These days, I use frequency of the request stated in other words as my measure rather than its volume.

Think of translating each request into its corresponding problem. "CSV export" is typically "I want to present this to my boss." Sometimes just one tiny tweak solves two requests.

How do you break ties between requests? By revenue, effort, or instinct?