Why cant my team tank?

Is it due to my equips or? I've noticed (especially beast) the tankings been really poor got most LFs this year apart from gotenks and TOMku so if swapping someone in for a tank is the best lmk

Is it due to my equips or? I've noticed (especially beast) the tankings been really poor got most LFs this year apart from gotenks and TOMku so if swapping someone in for a tank is the best lmk