https://www.pcgamer.com/this-pillars-of-eternity-2-mod-ramps-up-the-difficulty-by-tweaking-level-scaling/

I've found Pillars of Eternity 2: Deadfire to be a tricky RPG. I bounced between Classic, Relaxed, and the breezy Story difficulty modes for most of it, depending on how much tactical combat I was in the mood for. But for some people, it's a little too easy. If you're one of them, then modder maxolina has you covered: they released a difficulty mod at the weekend that adjusts enemy level scaling to give you a harder time. 

In the base game, enemies only scale up a maximum of four levels, so if you're at level 20 and you come across a level 10 enemy, they'll only scale up to 14. The Deadly Deadfire mod increases that maximum to nine levels, so you'd face a level 19 enemy instead. Important named enemies automatically gain an extra two levels on top of that to make boss fights even harder.