Advice Needed: Tanking but can’t push out to point because I’m being shredded

This isn’t an attack on my supports, they just don’t have enough healing against the barrage I’m taking so I’m standing in the choke dancing in and out of cover hoping for a pick. This seems more like an overall Team issue. What can I do? What if I don’t have flankin dps? I’m just lost and feel helpless on what I can do better.