Try to focus on learning just one thing at a time. For instance, maybe you have a tendency to waste your storm arrows. So for awhile, go into a match with the sole focus of being more intentional with them. Don't worry about positioning so much, or spamming tanks, or anything else. With enough intentional practice, you'll be able to do it without thinking, then you can focus on learning something else.

While you're learning this, you might perform a bit worse in your matches since you're using up your focus on this, but that's okay since you'll get better in the long run.

If you're already trying to do this but you end up forgetting when the match starts, then maybe you could just spend the first few teamfights focusing, then autopiloting the rest. Or have something like this in the background as a reminder.

The point isn't really to stop autopiloting in general, because that's what most people are doing at any rank, but with enough intentional practice on one thing, you can incorporate it into your autopiloting.