You are not in an enviable position. But there is hope.
Find the one or two persons who are hopeful and begin intentionally investing in them.
Even before talking about church health, build trust and relationships that are God centred.
Eat, fellowship, study God’s word and pray together. Take them on your pastoral visits, empower them by inviting them to share in your pastoral duties, encourage them to extend their circles of influence in the congregation and, be prepared to spend a whole year doing this before seeing movement.
Once you feel you’ve got enough currency and feel that these few have a credible voice in the congregation, go to step 8.