Advice on scaling users / good marketing & creative agencies to work with

Hey everyone! I’m GP, founder of Flock — a group travel planning app for friend groups. We help people go from “we should take a trip” to actually being on the trip together. We’re early stage, ~550 organic users, and just starting to think seriously about paid acquisition. No agencies yet — all growth so far has been word of mouth and invite-based. Would love any recommendations on: • Marketing or creative agencies that are good with consumer / social apps • What’s actually worked for you at early stage (pre-Series A) for scaling users fast Happy to share more about what we’re building if it helps give context. Thanks in advance 🙏