One good way to tenderize a steak is to place it between sheets of plastic wrap lubed with a little cooking oil, and use a flat meat mallet to pound it into the desired thickness. Or skip the plastic wrap and use a “toothy” meat mallet.
I cheat and use an LEM brand meat tenderizer attachment on my meat grinder and it works like a dream. It’s an expensive tool but really well built. Should outlast the owner. I have no relationship with LEM, just a happy customer.