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connect with the client's personal/social events such as their birthdays, anniversaries, graduations, achievements and congratulate with a personal note and a note if the product needs any review! Scanning through social media and maintaining a comprehensive database with automation of some information would be of great help to do this.
Simple: Treat them like "Royal", get them like "Loyal."
Quality across the board, from product - to service, to communications, even after sales care.
Once you do these things at a level better than you would accept yourself, this will build loyalty and return busienss