I personally think your voice is very pleasant, but if you’re looking to sound more relaxed (if that’s what you’d call it) on the higher notes, I have some tips that may or may not help you.
Some trainer singers use a teqnique where they sing while dropping their larynx. It makes for a more full and open sound, and can also make your singing sound more carefree and effortless at the same time. Here are the basics of it:
• Try and keep your vocal chords, larnyx, and muscles all as relaxed as possible.
• Make sure you’re breathing from your diaphragm.
• If at any point when you’re trying this out, you
feel a tightness under your chin, then that’s not what you want.
• Singing with a “yawning” effect will hopefully open up your range more, as it’s a way of vocalizing. This is a way of dropping your larnyx.
I hope that helped, and if you need time to elaborate on anything, please let me know!
(sorry for the late response)