I'm a bit old fashioned in that business relationships are everything. These take time to develop because it involves trust building. It only takes a handshake between two honorable men to do good business because their word is their bond.
Maybe it's poor advise in this day and age of legal contracts.
It seems to me that the barrier you are trying to break through would be that first transaction. Do that one thing and successive deals might become easier to accomplish.
Maybe set your sights low on that first deal just to break the seal ?
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