Your going fishing. You found the big lakes like Family Search, Find-a-grave.
Now you want to start finding the small lakes, ponds and hidden fishing holes. So you need to start asking the locals.
Where do you want to go fishing? Contact the Libraries and State and local genealogical and historical societies.
Look for surname groups, family associations, dna groups.
Start asking around.
Also, visit Cyndi's list.
The good sites are the ones that have your ancestors, where did they live?