O that was so much help!! U put it very nicely!! Thank you 😊
There is no reason to be stressed about that, horse riding is first a pleasure and if you don't like the way your trainer is anymore, you could just leave as you want.
The most essential thing is to stay polite, don't be agressive or direspectfull.
Just tell him that you need to see news things and new ways of riding in order to improve even more your style.
I hope i could help you :)