おお、とても光栄な話ですね。あなたの会社の作品はとても素晴らしい。
ニューヨークのスタジオ、できれば訪問してみたいです。素晴らしいお誘いありがとうございます。
ただ、私は英語でお話もできませんし、人前でスピーカーとして話すことがとても苦手なのです。とてもうれしいお話なのですが、スピーカーとしてお話するという部分はご期待には添えません。本当に申し訳ないです。
I want to visit your studio in New York if possible. Thank you for your wonderful invitation.
However, I regret that I cannot enjoy talks in English, and besides I’m not generally very good at making a speech as a speaker in front of others. I’m pleased with your offer, but please understand that I cannot meet your expectation for me as a speaker. Very sorry about that.
The fine arts of your company are very attractive. I hope I could visit your studio in NY if I will have a chance. Thank you for your fantastic invitation.
But I cannot speak English, besides I am clueless of delivering speech in front of many guests. I thank you for your invitation but I’m sorry to say that I will not be able to meet your expectation as a speaker. Thank you and regards
I would like to visit the studio in New York, if I am allowed. Thank you for your offer.
However, I can't speak English and also am poor at speaking in front of people.
It is a very prideful offer, but I won't be able to meet your expectation to be a speaker.
I am sorry for it.