At a loose passive table, you want to play pretty much the opposite which is tight aggressive. Stealing blinds doesn't work that much unless you raise it to a sensible amount that they will fold to and in late position.
Loose passive's are like level 1 thinkers. They only really care about what they hold. If the board reads JT987, they'll think that their jack high straight is good when if I shove all in for 27x the pot with my even higher straight. A good player notices this and when they have KQ, will bet big for value.
If you are card dead, just look for cards that play well multiway e.g. Ax suited, connectors, suited connectors. Even though we might not have the greatest of hands, if we flop huge it is likely we can steal someone's stack off them. If you can't pick up any of those, then just pray and hope something lucky happens e.g. you get moved to a new table full of TAG's or you flop a full house etc.