ZEC, LINK, and TRX have been identified as promising altcoin performers for December. ZEC is currently in oversold territory with strong support around $300, suggesting a potential rebound. LINK is consolidating near its support level, buoyed by news of ETF approvals that may attract new institutional interest. Meanwhile, TRX maintains key support at $0.27, with recent network upgrades enhancing its efficiency. These developments are drawing attention to these altcoins due to their technical and fundamental strengths.