We tried Jitsi Meet with 7 persons. However, the bandwidth became the bottleneck for many of us. We are switching to Zoom.
Maybe Jisti Meet could start with parameters that could depend on the smallest bandwidth among the existing users. Then the frame rate and the resolution could be changed automatically. If needed, the stereo sound channels could be merged into a mono sound channel (even if the micro is stereo). When the smallest bandwidth among all users is enough, then all user instances would slowly increase their resolution and/or frame rate. When it is quiet full, then all user instances would quickly lower a few their resolution and/or frame rate.