Illegally parked cars encroaching on the crosswalks would fall under PPA for ticketing. Try reporting via 311.

As for planters or other infrastructure, try reaching out to the Fairmont Park Conservancy. Not sure if that part of the city also has any business improvement districts, but that may be a good place to start too. If you don't hear anything back from the above entities, try reaching out to Feet First Philly as they may have some resources to point you to. Once you make these initial contacts and have some correspondence going, then you may want to loop in your councilperson.

Hope this helps!