I have had some good luck matching with cousins via FTDNA and Gedmatch. But there are folks who do not respond to your emails.
I find the easiest way to get their emails is to download the data from the browser. It then lets me sort and look at the data in different ways.
As to resources for researching female line...
Marriage records and sibling records can have clues.
Census records sometimes have relatives living with a family.
Family correspondence... it has been my experience that the women wrote more than the men. Old postcards / letters / etc can often hold info you just can't find in other places so clean out those attics, basements, and old junk drawers... (Don't overlook recipes... Aunt Lorraine's cookie recipe may give you the name of your father's brother's wife...
Wills and probate records
School records often name both parents.
Burial records and tombstones sometimes have data on them.
Hope that helps!