Sure! Here's a polished and engaging rewrite of your post:
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We're excited to celebrate the legendary Bitcoin Pizza Day!
Invite your friends to start mining BTC and enjoy a slice of amazing rewards!
The top 20 users with the highest total average referral hashrate during the promotion period will share a prize pool of 2,000 USDC in token vouchers!
Start referring and mining today to earn your share!
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Let me know if you'd like variations for different platforms (e.g. Twitter, Telegram, or a blog post).