Ethereum's price could reach $3,500 with the successful Pectra upgrade, but faces competition from Cardano and Remittix in April.The Pectra upgrade aims to improve Ethereum's scalability and transaction efficiency.Cardano, with its low-cost solutions, poses a strong competition to Ethereum in the blockchain ecosystem.Remittix's real-time crypto-to-fiat conversion presents a game-changing option for cross-border payments, challenging Ethereum's status.