Ethereum remains under pressure. USD 2,500 represents a strong support level. The Altair upgrade is scheduled for late October. The cryptocurrency market continues to be under pressure this trading week and the risk of further declines is still not over. Ethereum ETH/USD has weakened from $4,025 to $2,700 since early September 2021 and its current price is at $2,800. Altair upgrade is planned for the end of October All major cryptocurrencies have weakened so far in September 2021, Bitcoin briefly…