Hi [first name],
Thank you for your email, I am thrilled to be offered [x position]!
Knowing that I'll bring a lot of value to the team based on my experience, I'm wondering if we could explore a higher starting salary of [desired amount] for this position.
I am confident that the expertise and work ethic I am bringing to this role will help [company name] continue to grow and achieve success and I am excited about the potential to join the team at [company]!
I look forward to hearing from you.