Hi Jan
I have one line that stops like that in Kirkcudbrightshire but I'm bashing away at it using the Kirk Sessions records (they'll be at NAS in Edinburgh and possibly a copy locally)*, wills, old newspapers and local archives.
Also, if they used the traditional naming pattern for their children, this might give you some leads.
Regards
Gadget
* not sure where you live as it's not on your details and it might not be easy for you to get sight of these. I've spent holidays in Edinburgh and South West Scotland so that I could look for info. Other idea is to use a professional genealogist from the area but this can become expensive.