Welcome
At level 13 you can most certainly get started on the archived critical missions, which will not only let you enjoy the storyline but will also get you some cool gear and/or visual effects.
The tickets to start said archive missions can be purchased from the Archivist Vendors located in these locations:
Merovingian, Apollyon x:224 y:1 z:-1514
Machine, Midian Park x:1215 y:1 z:-1155
Zion, Moriah x:1114 y:7 z:-75
Note that you don't need to be in that org to do it's archive missions. In fact, if you want to get the visual effects you will need to do the missions from your selected chapter for all 3 orgs.
You can also keep doing the neighbourhood contact missions as there are contacts in most neighbourhoods in the city. Some of them just take a little looking (or a handy list) to find.