Some methods have already been mentioned by others, for example, importing multiple addresses into one Electrum wallet, in watch-only mode.

Another option is to use crypto portfolio tracking apps, such as Delta App, CoinStats, CoinTracking, Blockfolio, Coinigy, etc. These apps allow you to manage and track your cryptocurrency holdings across various wallets and exchanges. You can import your wallet addresses, master public keys or connect directly to supported exchanges to automatically sync your transactions and balances. They provide real-time price updates, portfolio performance analysis, and even customizable alerts to keep you informed about market movements.

Be careful, though, as there have been reports suggesting that some apps might collect and share user data with blockchain analytics companies. I would not use these apps if anonymity is of utmost importance to me.