xpub is exactly what I was looking for. This shows my entire balance. I remember reading about xpubs but it didn't click until now. Thank you all!
You can use master public key to know your total balance, but not on blockchain explorer. Best to just import the master public key on a wallet like Electrum and be used as a watch-only wallet.
Just a small correction: There are some blockchain explorers that can work with Extended Public Key (xPub, yPub, zPub), for example Blockpath (
https://blockpath.com). But I agree with you that a watch-only wallet is a better option for watching your address balance.