One of the advantages that I really like with my Monzo card is the ability to use it abroad without worrying about extra charges. It is brilliant!
The other is the categories that are available and the amount of Spend per category. I can keep track of my spend easily.
What I would like to see is the ability to group payments into trips. I can then see how much I am spending while away. It could be achieved with a custom spending category, which is a quite popular suggestion already, or on another section dedicated to travel/events.
It would be useful to set up a category (a trip to Paris for the week), add a budget to the category (€500) and then keep track of the budget as I spend.
Thanks for allowing me to feedback and hope my insights help!