[Millionaire]

I'm playing in the master league now and formerly a mid gm long time ago. As a random player I understand imbalances and always abuse them to their fullest potential . Tvp is one of my best matchups but I have never been able to beat a Protoss of equal skill in late game when I go bio . Mech n sky Terran are definitely out of the picture. Now my question is how do I engaged a Protoss army consists of gateway units , colossus, observers , high Templars and dark Templars for harassment.I have tried going mass orbitals sacrificing all my scvs to get a huge supply advantage but still lose. I have tried sniping observers , scanning everywhere and landed almost perfect EMPs but still not enough. Pls help