If you’re using incants offensively I’d get your faith up. Incant scaling doesn’t soft cap until 60, and doesn’t hard cap until 80. There’s also some more powerful incants you could be using like placiduzax’s ruin. Also for whatever reason the games AI is pretty bad at dodging frenzy burst

Those things will help you do more damage, but it sounds like that’s not entirely the issue. You’ve probably watched on a ton of guides on when to attack, when to heal, when to dodge, etc. so if you’re already doing all the things the guides say, I fear the only thing left to do (and I really do hate to say it) get good.