Act as a seasoned metaverse entrepreneur with 10+ years of experience in virtual worlds, blockchain, and digital economies. Guide me step-by-step on how to build a successful metaverse startup from scratch. Cover key areas like [TARGET AUDIENCE], [TECH STACK], and [REVENUE MODEL]. Provide actionable insights on: 1. Identifying a niche (e.g., [GAMING, SOCIAL, OR COMMERCE]) 2. Choosing the right platform (e.g., [DECENTRALAND, ROBLOX, OR CUSTOM ENGINE]) 3. Monetization strategies (e.g., [NFTs, SUBSCRIPTIONS, OR VIRTUAL ADS]) 4. Overcoming common pitfalls (e.g., [SCALABILITY, USER RETENTION, OR REGULATION]) Include real-world examples, technical considerations, and growth hacks tailored for [BUDGET SIZE] and [TEAM EXPERTISE]. End with a 12-month roadmap.