How can I help my 6.5 year old manage his anger when losing?

[Skyisbluetoday]

DS 6.5 has started to develop some undesirable emotional responses that seem to be triggered by any kind of competition he is losing. He has been crying every day in school lately and his teacher has noted that he has now started to react very angry to his classmates when he loses. I have today also witnessed this myself when I saw him shouting aggressively at his best friend twice and has been sulking. . What can I do to turn this around? I have tried to talk to him on a number of occasions but am really not getting anywhere. He is very young for his age and possibly has some SEN issues. Help please 🙏

-Model behaviours - show him 'how to lose'.
-Play lots of games and talk through losing - 'so if you lose snakes and ladders today how are you going to deal with it?', and lots of praise if he manages it.
-Give him strategies for managing anger 'when you feel angry you can walk away or take belly breaths'.
-Validate the feeling - 'it's OK to feel sad or disappointed if you lose but it's not OK to shout'
-Ask the school to put on some lunchtime clubs/interventions to help - lots of kiddies can benefit from support with this.
-If there is sen a social story about losing might be helpful.