There is a change coming to AncestryDNA soon. It will take effect in early August. Ancestry is going to be changing their algorithms to improve quality of DNA match results. That’s wonderful. But they also will be removing all 6 cM and 7 cM matches. (According to another post I came across at a different blog, this might also include some 8 cM matches—I guess they round off matches to the whole number.) 

These distant can be very helpful and important to people with ancestors from Europe. We don’t have as many matches as those who have had ancestors in America for centuries. 

You may want to save some of the 6-8 cM that you have. They will be saved if you have “added a Note” or “put them in a group (colored dots). Some distance matches you may want to save are those who share a “Common Ancestor”, have a surname or location you are researching, have a nice size tree, or are connected to your “True Lines”.  Randy Seaver has some very helpful information in one of his posts at Genea-Musings discussing this. Go to https://www.geneamusings.com/2020/07/ancestrydna-changes-coming-soon-what-im.html . Included in his post are hints for saving some of those matches. He also includes links to other blogger posts on this subject.