I tried to build a todo app a few years ago with a similar thesis -- that the problem with todo apps was triaging the list.

So we built an app that did it for you, just like yours, using machine learning and AI (and some simple rules based on due date and expected time to do the task).

Turns out people don't want to pay for that, even at $2/mo. We even had group features, so that a parent could put tasks on their kid's list, or a group of students could use it for a group project, or a team at work could use it to coordinate team tasks.

We also had templates -- tell us you're a single person who lives alone, and we would auto-add tasks like washing the sheets and cleaning the toilets. Or we could add a daily exercise routine or even a daily bible study if you told us you were a religious Christian.

Feel free to take these features. I hope you have better luck than I did.