RTwP can take some getting use to. You're expected to manage and understand a lot all at once and while it's not the most complicated thing out there it's easy to kind of just go through the motions and never really get a strong grasp on how everything works. Which is for some, but not others and it's not surprising combat doesn't click. PoE admittedly doesn't have the best pathfinding so it can feel awkward and clunky at times in big fights, especially if you're relying on the AI to control things instead of directing party members yourself. The game does offer a ton of auto-pause options to help provide more feedback. Like weapon ineffective, enemy killed, ability completed and so on that are worth looking at if you're feeling like you're missing out on feedback.
While not exactly required, but to get the fullest out of things in my opinion, I would recommend spending some time to really understand all the stats and formulas the game has. Really get to know and understand Defense Types and Dmg Types when attacking certain enemies and using different abilities, how Attack Resolution works in relation to that so you're not using abilities or weapons that have low hit chances or do minimal damage. Knowing how Attack/Recovery Speed works is vital so you don't overburden your party members so they take forever between attacks and Attributes of course which feed directly into everything. Once you really know how that stuff works a most things will start to fall in place. What weapons and armor types work best your party members and for certain enemies, what abilities and talents are useful for you and in different situations, how they really help you and when to use them and in conjunction with one another.
Any good strategy to start out with is to just turn take full control and micro manage everything for a little while. Turn off the AI, constantly pause, be in control of every action and really take your time reading over the combat log outcomes, enemy descriptions, ability descriptions and so on. Being in full control gives you a better chance to see exactly how things transpire from start to finish, what worked and what didn't. As well as just getting comfortable and familiar with RTwP in general and the flow of things. Once you're more comfortable and familiar with things the combat can really open up and you can make it your own. I love RTwP because it gives you the freedom to take things as fast or slow as you want them, and knowing exactly how everything works really allows you to take advantage of that.
Like I said PoE isn't some super complex game unlike any other, you don't have to do this or have deep knowledge to play or enjoy it, but PoE was the first RPG I truly took the time to actually learn and understand the rules thoroughly and not just enough to get by and it absolutely paid off. What amounted to a handful hours or so of reading some explanations, watching some vids and really taking things slow in game resulted in one of my fondest gaming experiences and level of confidence in play that was just really damn fun and satisfying. It seems like an unreasonable investment but given the game can provide 80+ of playtime, not including the very excellent White March expansion, it's worth it. The wiki site is a valuable reference for anything you might not fully understand through the ingame tooltips alone.
https://pillarsofeternity.gamepedia.com/Combat. Definitely worth checking out.
And while I really loved PoE's combat, Deadfire is just better in every way. So it's totally worth it to get through PoE and see all the new options and improvements in Deadfire. As well as continuing the story and exploring the world of Eora.