Hello. Got to think out the box in order to be different. Over the next few years there will be a boom in wealth for new money people. Those are the clients that will grow your business. Old money that has been passed from generation to generation will already have their valuables secure.
Where is the new money coming from? Crypto currency investors will be a big one and will be requiring your expertise for storing valuables. I would suggest marketing on the twitter accounts and web pages of various crypto currencies to find new clientele. Marketing in a way that is different and not the same old boring man in a suit scenario. Content for the new clientele based on things that will interest someone with new money. Travel, cars,fashion and jewellery.