Leaving a travel team for a new one

How and when is the right way to tell a coach we are leaving the team? We don’t want to burn bridges bc the coach has been nothing but great to my daughter. Lots of playing time and one of the best in the team. I know this will come as a shock to him. We are willing to finish the month and do things “right” but my husband thinks that once we tell the coach he will be done and not want us there anymore. There are 2 big national tournaments next year and he is beginning to prepare for those so it might be a waste of time to invest in her if she is leaving. The parents have been great and so kind so I’m bummed to be leaving. My kids is 1st year 12s. The org we joined is a well known org and we just don’t like the way they are known to yell and belittle the girls. It’s bad. We have seen it with all the teams in the org. It’s like they are know to be like that and all the coaches just try to one up each other on the mean-ness. That mainly the reason to leave.