Give you a half-formed idea and an afternoon and you will come back with something that works. It is not luck. You are unusually good at seeing which pieces are already in the room and what they could be if arranged differently.
The cost is that people bring you their problems, and you take them, because solving is genuinely pleasurable to you. You end up carrying projects that were never yours.
The Magician is at his best when the skill is pointed at something he actually wants. Ask yourself, occasionally, whether the thing you are building is yours or whether you took it on because you could.