Tips for increasing range in whistle tone

[teal mountain]

any advice how i can improve my whistle note i can sing till a A7 but going higher is a strain any tips and how to mkae it sound better?

[loud herald]

Honestly, as far as my research and learning goes, it really does boil down to muscle strength. Lips as a muscle are well toned, because typically they are hyperactive, so you really need to focus your muscles to achieve contractions necessary to produce notes as high as that, so you gotta keep practicing to hit them. Once you get a whisper of the tone, you'll be in business.