First, be crystal clear about what business you are in. "Customer sales and service" is ambiguous. Are you an outsourced sales organization? An outsourced helpdesk? I suggest you focus on ONE of those, build a business based on that and then go the other.

It's interesting that your service "helps tech/online businesses acquire and retain more customers" yet you are asking for help in acquiring and keeping more customers! What advice would you give yourself?