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I penciled in this map of a fantasy rendition of Zaragoza, Spain. Where do I go from here? I could/want to draw it out in pen, however I made many parts of it too small to be accurately covered by my pens (which are fine tipped as is). Anyone got any tips?
Also if there is anything I should change (as it is still in pencil), I appreciate it.

For context:
I sketched this on a stray piece of paper I found while I was at the Zurich Airport with a 17hr layover. (so I know the paper isnt perfect)
Zaragoza is a city I lived in for a while. It really left a big impact on me so I decided to work from memory on the sights and places that changed my life there.