Synonyms of parochial, "characterized by an unsophisticated focus on local concerns to the exclusion of wider contexts", may serve. Such synonyms include confined, insular, limited, local, narrow, narrow-minded, petty, provincial, regional, small-minded, isolated.
Insular, for example, has a sense that means "separate or isolated from the surroundings; having little interaction with external parties; provincial." Narrow-minded and small-minded are of course easily understood, and so would be close-minded.
Blinkered, fitted with blinkers, or "eye shields attached to a hood for horses, to prevent them from seeing backwards and partially sideways", is another possibility, as are formations from synonyms blinders and winkers.
Edit: Also consider monomania, "excessive interest or concentration on a singular object or subject" or "a pathological obsession with one person, thing or idea"; obsession, "compulsive or irrational preoccupation; an unhealthy fixation"; idée fixe;
tunnel vision, "an extremely narrow point of view; narrow-mindedness"; and locked-in.
Best Answer
wordsmith
wordsmithery
There are phrases like "author extraordinaire" and "wordsmith extraordinaire" also.