am i doing something wrong as tank? it always feels like my team is under perfroming...

tank player here, high plat low diamond, and I often play w my friends that are low plat to gold. I always seem to have a difficult time winning games because they often get diff'ed. I just played 3 games in a row where my dps that I'm queing with went negative. they don't try to change things and they often play a lot of different characters, so idk what hero pool they have/i don't know what they are doing wrong.

but one thing is common in all of the games we lose...

my friends always die first

and as a tank player I don't know what to do to prevent this. and it doesn't just happen w like a tracer or a sombra, like they always die to a ashe, a cass, a genji, literally any dps they die to even if I'm helping or not. this dps player is a plat dps and he doesn't play bad when I watch him, but it genuinely feels like he is throwing my games when I'm playing with him.

this also happens in solo queue, but not nearly as often. Idk it seems like since bans came out I have been terrible at the game and it seems like I'm in a slump.

i guess my question is...

it seems like my teammates are always under performing no matter what tank I play or what map I'm on, is this my fault or am I in a slump right now?

should I position more defensively, should I become more of a threat? is there a character pick that I can fall back on to protect them, or is it even worth it to protect them.

example replay code: BF5B8K (game crashed after my last death)

my three stack is BOBOSING, LEROY, squelchhh