As a professional Bubble Developer, setting yourself up on a Bubble Agency plan can be a game-changer. This plan offers features such as pay-per-seat pricing, access to the app API, free plugin subscriptions, and more. Optimizing your agency profile is also crucial, as it showcases your work, services, and process to potential clients. Leveraging Bubble's RFP portal can help you find clients, but expanding your reach to other platforms like Upwork, Fiverr, and social media can also be effective. A strong pitch that highlights your budget, past work, reviews, and testimonials is essential for winning new clients. Finally, building strong client relationships through iteration, feedback, and smooth app transfer can lead to referrals and a successful business as a freelance Bubble Developer.