Have Them Call You So You Can Sell Them
If you are not in a rush to get to the high-level decision maker, you might want to make them call you.
Create an automation sequence specifically for them. Include emails, snail mail, couriers, as delivery mechanisms. The main point is to make this long and intensive and always to be creative in having a reason and a benefit for them to receive your communications. Each communication should have one call to action: call me.