The problem (one that I've had before) is that you're playing so many agents that you can't really learn any one of them. Focus on 1 or 2 agents (or 1 or 2 per map, at least) and ONLY play those agents, at least for a while. Learn those agents, and learn them well. Soon enough, the correct utility will be instinctual—you won't have to overthink with your abilities because you'll be comfortable using them so it'll be second nature. That way, you'll not only get much more impact than if you simply lock Reyna every game, but you'll also find your games are easier and less headspace-consuming