When you receive an enquiry from a new customer, why not simply ask them how they found you? Businesses usually keep a keen eye on their rankings for the key terms they are targeting, but often they perform well for terms they never intended to target, but which are still closely related to the products and services they offer.
Scour forums
Online industry forums can be a veritable treasure trove vk database of potential key terms you may never have thought of. What sort of questions are contributors asking? What are the main topics of conversation?
Once again, Google’s Keyword Planning Tool is the best bit of kit for the job. Simply plug the URL of the industry forum into the planner and wait while it grabs a range of terms which appear in the forum on a regular basis. You can then scour the list for long-tail ideas which are particularly relevant to your business.
Suggestion tools
Tools such as Übersuggest can make short work of unearthing potentially lucrative key terms. Type your keyword into the query bar and Ubersuggest will busy itself by producing related suggestions which are listed alphabetically. You can then dig through the list to find those which are most relevant to the products and services you offer.