Hi BTZ and welcome.
You're not the first and I don't think you'll be the last to have a hard time getting attached to a mully. Without knowing where you are and whether you are boat or land based it is a bit hard to give advice though I reckon you've worked out the first good bit of mully advice, warmer months are better for catching mulloway. Sure they get caught year around and freezing cold winter nights are apparently the best time to get the monster metro mullys here in the Port but when the water temperature gets up your chances of hooking one goes up exponentially.
The other tip I can give straight up is it isn't easy, 10 trips without a sign of life is normal and anyone telling you they always get them is flat out full of cow manure, sure sometimes you'll find a snag or hole that is almost a sure thing for a season but it never lasts forever and it can be a long time until you find them again. So my final and best advice for you is don't give up, if you're fishing an area you know holds them keep putting in the hours, mix up technique, location etc and you'll get your mulloway or even your first few in as many casts (they can be like that) from there it gets easier, but never easy. Welcome to mulloway fishing.
