I'm using AdGuard. It does cost me about US$30 a year, but it's worth it to me. In the last week, it's stopped an estimated 192,085 ads and trackers saving me an estimated 2.1 GB of data.

It does occasionally block things that I don't want blocked, but it's easy to fix: you can either temporarily disable protection by tapping the notification in your, well, notifications, or you can use its Assistant feature to quickly find the thing that shouldn't have been blocked in the log and add an exception.