汉翻英：承蒙惠顾，非常感谢！

we appreciate your business!

承蒙惠顾，非常感谢！=Thanks for your continued patronage!

i appreciate you for coming to us, thank you very much

Regards 或者 Kind regards
空两行然后署名

appreciate for appreciating

We are very grateful to you for your patronage.（最好用这一句）
也可以说 I am very grateful to you for your patronage.（对于一个人开的店铺）