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Privacy tools' has some great info on alternatives: https://www.privacytools.io/software/passwords/

Bitwarden is your best shot, it's the only open-source one that allows remote syncing across all devices. You can build everything yourself as well: https://github.com/bitwarden

Switch early (now) or switch never

Study the password manager solutions well (I am sure there are some posts for it)

Switch your frequently used first to get used to the new one and switch the rest at your own pace

Google password manager doesn't support sharing passwords. As soon as you need that, Google's solution isn't going to be enough for you.