Firefox containers solved[1] this for me. They are probably the biggest privacy boost I've felt for a decade. I've got three separate Google containers (private Google account and general Google properties like youtube, and two separate Gsuite accounts), individual Facebook, Reddit and HN containers, a separate containers for various banks I interact with, another separate for online purchases (plus goodreads, because I don't want Amazon to leak), and an individual Pandora one (because why not?).

1: Well, "solved" in that it's harder for them. They can still track me, but at least now they get conflicting cookies from different types of sites but the same IP which might confuse their metrics some. I'm aware I'm probably just making it harder to state anything about me with too much confidence at most.