Firefox Focus is my go to browser on Android, and it has ad blocking built in (as well as cookie / history erasure).
That said, have you tried installing Blokada from FDroid? It sets up a local VPN on your phone and routes all network traffic through it, blocking all ads in all apps. It's astonishing how many ads and trackers your phone would otherwise download in a week.
Having a VPN for ad blocking is unfortunately a really bad option, as you should already have a VPN to prevent your "open WiFi" and LTE provider spying on you.
Firefox Focus is my go to browser on Android, and it has ad blocking built in (as well as cookie / history erasure).
That said, have you tried installing Blokada from FDroid? It sets up a local VPN on your phone and routes all network traffic through it, blocking all ads in all apps. It's astonishing how many ads and trackers your phone would otherwise download in a week.