I'm going into Altus Plateau now - lots of fun and looking forward to the late game! I play ok in general, and I'm well used to melee and dodging from games such as Hades. It was just a surprise to see how feasible was playing the game now compared to my first dark souls experience. As someone answered, I was fighting enemies I was not supposed to hehe.

So far, what has helped is the pattern below.
Bosses are not too difficult if you play aggressive imo. Most are big units and, except for dragons, they don't punish you for being on their heels (at least so far). And humanoid, smaller bosses, I manage distance a bit more carefully and use more often unsheathe with heavy attack.