Until you get a chance to leave behind Google’s Android operating system completely, here’s an article I saw with a few fairly simple things you can do that will reduce (although not eliminate) the ability of Google and others to scrape your data and monetize you.
I already do step 1 (Firefox etc). But looking at step 5, for example, my phone had all those ad options set to “on”.
Alternative is TrackerControl - again a local VPN, but aimed at blocking trackers (which could then include ads)
Find it on FDroid: https://trackercontrol.org/
Yes, that’s a great FOSS alternative.
The only reason why I don’t use trackercontrol is that I can’t use it at the same time as an actual VPN. And since I already paid for AdGuard, it’s on all my devices. 🤭