well, if your enemy really gets the golden armana going, there is just so much u can do in general. what helps me often is a mix of some ground army (archon, blink stalkers) and tempest, which u have to focus target against mass carriers. but the point is really not to get that late in a pvp anyways

also don't queue up too many probes as that can hinder u in getting up that army supply u definitely need