How to fix flaps from the trunk?

Hello guys, I notice that my car just doesn’t want to give you any rest. The tailgate is no longer firmly anchored in the lock and the “folder dampers” (i.e. the rubbers right and left bottom) seem emptied or so, so that the flap is movable and causes noise especially in bad road. Is there, except felt glue pads, other remedy? Can you renew any parts so that there is NO more game between flap and body? What do you do against clapping interiors? Thanks for tips/proposals, Jacky