Yes, try Firefox. It's not proper Firefox because Apple doesn't allow it, but it might make a difference.

Neither Firefox nor Safari on iOS will run add-ons.

I use - as a phone - an iPhone 5s - the last of the still-updated 4" ones. It runs iOS 12, which I don't think will run ad-blocking apps, though I'm not sure. I don't use it for browsing - apart from checking bus and train times.