Make no mistake about it. The other player has taken the field. They sit in their stone impenetrable fortress. Their offense is to simply wait and do very little. They sit back and laugh while you waste precious time and resources trying to breach their stone walls.
My advise? take a chill pill and relax. There strategy evolves around you throwing yourself against the rocks. Pull back! Regroup! Rally what resources you have left! hopefully you still have some left. Don't try to negotiate any more. Just wait for them to attack and you defend. But you have no chance if you continue to blow your resources and mental energy attacking their stone walls.
(edit) also if your lawyer is expensive stop talking to him, don't call him for little stuff. Definitely limit your visits with him. When your X trys to make a legal move, file to change lawyers. This will give you a chance to try and downgrade your legal expenses and waste your X time/money as well.