Would like to be a better tank.

Hello everyone!

I am predominantly a strategist player (luna, invisible woman, occasionally mantis, and cloak and dagger (love the new skin by the way). How would I go about being a good tank, because I've tried to switch when theres three healers in order to be a second tank. I would like to learn how to be better and not get my ass beat (but at least I'm absorbing damage????).

I'm currently reading a bunch of the comments, thank y'all so much for the help!!