If you have to conceal metadata (Ukraine has me thinking about this), you're somewhat in spy-vs-spy territory, and you and your communication partners need to know what you're doing and probably use ad hoc methods depending on the exact situation. Note that it's very difficult to keep your email away from google: even if your own account is on protonmail, when you email your friend, without prior selection there is a high chance that your friend is using gmail. If you do want to use email then this is somewhat in conflict with #2, since having both people on the same provider helps control leak outside that provider, and having both people use gmail is fairly innocuous. 3) protecting the metadata of who you are communicating with: for that, email has fundamental weaknesses.
2) Preventing your email content from being collected and analyzed by personal profiling companies like google: for that, it helps to use smaller providers, who simply don't the resources to embark on such projects.
state agencies: for that you need end to end encryption. There are 3 separate questions here: 1) protecting your email content from surveillance by e.g.
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