Two thoughts from my experience:
For nearly thirty years, 95% of my practice has been with Judo points shooting at tennis balls, leaves, dandelions, etc. Normally, I have just one Judo tipped arrow, and end up randomly shooting at targets from 5-50 yards, although 15-20 is probably the average. I never enjoyed shooting field points at a fixed target much, and my version ends up being great practice for hunting. I have MS, so my sessions aren't usually long because of fatigue and balance. I will shoot somewhere between 7 and 30 or so arrows, depending on how I am feeling for the day.
The other thought is something I read long ago about the retired basketball star Larry Bird. He was one of the finest pure shooters that game ever saw, and it was said he had a personal rule when practicing: Always quit on a successful shot for the sake of your mind. I have adopted that through the years, and feel like it is a really good step for the mental and psychological aspects of archery. If I am having an off day, I settle down, concentrate on form and shoot at a few arrows at a relatively close target until one feels right and results in a hit. Then I make note of how that shot felt, and QUIT for the day. Other times, when I've been shooting well, and suddenly have that magical moment when everything feels right, and something in your brain knows you are going to (and DO) hit the target even as you are just releasing the string, I say to myself, "Self... remember that!...." and quit.
It is amazingly satisfying when your last shot with a judo point center punches a tennis ball at 33 yards and "sends" it flying ten yards farther with a rewarding "thunk". Something like that always makes me say, "Enough for today. Remember that."
Best wishes in your journey. It sounds like you are really off to a good start.
Daryl