Crypto analysts are urging a disciplined approach to the 2025 altcoin market, as Ethereum (ETH) falls below $4,200 amid a market slowdown. Analyst Miles Deutscher notes a division between outperforming assets like BNB, MNT, and select DeFi tokens, and the majority of altcoins that are stagnant or declining. Deutscher recommends traders streamline portfolios, concentrate on high-conviction assets, and avoid chasing rallies. He stresses the importance of position sizing and timely exits from underperforming investments. DeFi researcher Stitch highlights that liquidity is concentrated, suggesting only projects with tangible value will thrive.