I'd keep it in one thread though. What's holding you
back from completing your map via this perspective?

If it's the houses or buildings, which I'm guessing
might be the case, consider asking a cartographer
who has done maps from this perspective before how
they conquered the task. You will find very experienced
mappers here. And they're normally willing to help.

What you've done so far really does look neat,
though I'll admit it's hard to see where you might
go. Best of luck.