Thankful for this opportunity

I have a keen desire for the position.

I'm highly motivated for this particular job.👍

I'm looking forward to working with you?

Excited for the opportunity?

Quite appealing

I look forward to the opportunity.........to.........
I look forward to the occasion to prove my potential.........
prospect to.;.........
prospective ..........
happenstance.........
all interchangeable but maybe lame...... I'm not sure.

I wouldnt hold back, I'd say I would LOVE to work there

Perhaps "greatly excited" or "intrigued" would work.

Use the goofy.

"Dear Amanda,

Thank you so much for taking the time to speak with me yesterday. This job honestly feels like a perfect fit—my experience has well prepared me for [the responsibilities of the role], and I have [the skills she is looking for] to [accomplish what she is looking to accomplish]. I know I would be a valuable, creative, and enthusiastic member of your team, and I can already tell that we would work well together.

Thanks again for the awesome opportunity. I look forward to hearing from you soon, and hopefully joining your fantastic team. Until then, good luck with that TBR pile!

Best,
Kelsey"

Sauce:
https://www.fastcompany.com/3057431/heres-what-to-write-in-your-thank-you-note-after-a-job-interview