Sagittarius on the inside, Cancer on the way in.
Your sun in Sagittarius (fire, mutable) is the engine — what burns at the centre, what adapts when you are at home in yourself. Your Cancer rising (water, cardinal, ruled by Moon) is the door — the way you arrive in a room, the first read the world takes of you, the body you walk in.
Strangers tend to assume you are sensitive and tidal — that is the Cancer arriving first. Then they get to know you and discover the Sagittarius fire underneath, which can be a surprise — the cool surface hid a hot core.
Reads as Cancer until you trust them; then Sagittarius comes through. The mutable-cardinal mix means you adapts on the inside while starts on the outside — internal and external rhythms are different, which is its own work.