How do you say youre very thankful in mandarin? as in "Thank you so much, you're too generous!"

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Answer

太感谢你了，你真大方（tai4 xie4 xie4 ni3 le,ni3 zhen1 da4 fang1）
generous=慷慨的，大方的
you can say 你真慷慨（ni3 zhen1kang1kai3）as well,but 慷慨is a little bit formal~
大方is more natural and common in oral chinese

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tai xie xie ni le, ni zhen kang kai.( 太谢谢你了，你真慷慨！）also can use: "da fang" (大方）instead of "kang kai"; "gan xie(感谢） instead of "xie xie"

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太感谢你了，你真的太好人了。 I think~