Sandra...go for it ! Put in the time with the coach. You make a great point about 'guest artists'...then the hiring venue want's that guy or gal and you're in a corner. Do it yourself. You've got a great head-start. A few pitch issues, but most singers do, so just do it... assuming you have the desire and committment to develop and get better.

I'd like to hear this same tune down a whole step maybe. Times in the tune when you're pushing your range. Go lower keys until you gain a bit more upper range ?