Pihole for network wide ad blocking (no ads on all apps on all devices within the LAN) then self-host a vpn to keep your phone within that lan.
Tis what I do at least.
Blocks pretty much everything except Youtube, and Twitchs video ads as they serve their own ads from their own domain’s as well as things like sponsored posts on reddit/twitter/facebook.
Don’t watch much Twitch, Youtube (re)Vanced is a thing, and Twitter/FB/Reddit can all die in a fire. So none of those are issues for me either.