You may have been the only game in town for a long time -- the only planner, the only stylist, the only documentary-style photographer, the only high-trafficked wedding website -- but those days are numbered, if they still exist at all.
"Only" is nuanced and competition presents you with a choice between being bitter or better.
You may still be the only one in the world who does exactly what you do exactly the way you do it, but to the untrained eye or new potential client who has never needed to hire your type of service before, that distinction may not be clear.
If you're finding that you now have others claiming to do what you do, throw yourself a pity party for twenty minutes and then get busy getting better.
Six Phrases I'd Like To See Die
False Praise and Mediocrity