Allow prioritization on cards
Give the user the ability to add custom prioritization levels and have shortcuts at the top of the board to filter these priorities out.

Thanks for the input, we plan to implement this idea.
We currently consider the list order as the main indicator of a card priority (within a list, obviously).
As a workaround, you can add a visual cue to your card tiles with the “indicator” custom attribute. You can pick a custom color for every attribute too!
There’s also a “size” attribute that allows you to indicate the weight of a card: S, M, L and XL. For now, you can filter by attributes.