Are tanks still good?

I've recently come back from a 5 month break and tried to learn shen and I just can't do it, but I'm still trying, but bit seems no matter what i do, come teamfights I get absolutely melted, like 1 second and im gone, I no longer feel like this huge wall even when I'm trying to farm minions (late not early) and people hit me, I'm constantly getting chunked so i tried poppy the champ tbat got me to plat 3 and I understand the nerfs on her, but again I'm just melting in teamfights, what's going wrong? is there something I'm missing?
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