Hi. Trying to be helpful. That sounds like too many after school activities is leaving him wiped out during the school day to me and making it harder for him to self regulate. I’d stick to two at that age. DD is noticeably more fractious due to exhaustion the day after doing an after school club or Rainbows etc. You can alternate activities and build up to more as he gets older.
When it comes to behaviour, as you probably know, it is down to positive reinforcement and one on one parental play time. You ignore ‘bad’ behaviour as much as possible as long as it isn’t dangerous and praise good behaviour so they know that good behaviour is what gets them attention.
Make 10-20 minutes a day to join your son in free play. He leads the play and you join by try to limit questions etc that will stop the flow of the play. Bonus if you can make characters out of Duplo or play doh for fine motor skills.
You can use the toys to emulate the kinds of behaviour you want to encourage. Get two action figures to share or take turns. The toys can express their emotions eg ‘I didn’t get a turn, that makes me feel sad.’
Some kids need more down time or to express themselves through play.
I wouldn’t bother with the series of books if it’s what i thinking of. It is best to read books that are fun and engaging for his age and ability. The actual advice is to let him choose the books that interest him as much as possible. Going into the library, choosing books together and reading them to him is honestly one of the best things you can do.
Try not to make him read to you every night either at this age, three to four times a week is going to help him without putting him off and making it a chore.
I hope you don’t mind me suggesting authors like Michael Rosen, Nick Sharratt, David McKee, John Burningham, Jill Murphy, Shirley Huges, Judith Kerr. The Julia Donaldson and Axel Scheffler books are popular for a reason. Poo at the Zoo, anything that is fun and engaging. My reception child likes the Super Happy Forrest Books at the moment as they are so funny with detailed illustrations.
Most of what you are doing sounds great, and he will no doubt improve as he gets older.