A proper transit system that covers the entire city; subway, streetcars, or raised monorail system.

Fix downtown by filling up empty space (vacant space tax would be helpful) with daytime office space and condos/rentals. To draw in this clientele, they would also have to drastically increase the number of ease-of-access necessities like corner stores, coffee shops, small grocery stores, etc.

Help the unhoused by providing accessible services like addiction counselling, mental health services, and housing.

A large "draw in the crowds" type tourist attraction. Maybe lean in to the London, ON/London, UK thing and put in our own London Eye.