I use DNS66 downloaded from F-Droid. It registers itself as a VPN, but it’s actually a DNS filter, not a VPN. It works to filter ads on most apps, and you can individually disable it for specific apps if needed.
I also use the Firefox app, which supports a few add-ons (much less than the desktop version), including uBlock and some similar options
I’d recommend one or both. They’re working great for me on a non-rooted Pixel 4a 5G
Maybe EndeavourOS (a convenient installer for Arch) with a desktop that supports Wayland.
I run that with Gnome in Wayland mode on my desktop and with Sway (Wayland equivalent of i3) on my laptop and I’ve been very happy with that. You could also run KDE if you prefer