need to add my sixth member to my family sharing

dalmata22 wrote:

But I don’t want to remove a member of my family from my family!

Sorry, but at present there are no other solutions.

6 is the maximum that Apple allows.

You've asked twice if there is an exception and been told twice no.

Feedback for Apple goes here >>> http://www.apple.com/feedback/

In the active family account maximum limit of members is six , the seventh member can't be added to it , however if any member leaves the account https://support.apple.com/en-us/HT201081 another person can add in the family sharing group https://support.apple.com/en-in/guide/mac-help/mh2fd47a0f16/10.14/mac/10.14

See the article https://support.apple.com/en-gb/HT201060

Send your feedback https://www.apple.com/feedback/icloud.html

As per the article https://support.apple.com/en-in/guide/mac-help/mh2b0f42b606/10.14/mac/10.14

You can remove yourself from a family at any time. After you leave a family, you may be able to join or set up another family. However, you may only join two families per year. (Rejoining a family or creating a new one counts against this limit.)

See the article https://support.apple.com/en-us/HT201084

Not using this Apple ID from this Mac , create a new different Apple ID and sign in on a different Mac , create a family account ( you as the organiser ) and join the members ( include the child also ) .