Right now, past due "Bills" show as red, but I want it to be clearer when some bills are about to be past due.
As a minimum viable product, you could color the due date #F67E4B or #EC7014 (both orange colors) for any due in the next 7 days.
As an ideal, there would be an option in Settings for "Show bills due in the next [X] days in [color]"
[X] would have a range of 1-30.
[color] would have a few common colors including at least two colors that are "color blind safe" (I don't need it but you should include accessible colors)