Mullvad has Adblock incorporated into their android app. Maybe that is something you can look into.

Or use their DNS? They have DNS that block ads.

That cleverkeys keyboard is… suspicious? Only 2 stars? 0 issues. Never heard of it. Seems like such a keyboard would be much more known, no? Do your due diligence before you install it, it is a keyboard, with potential to cause some serious damage.