你的赞助, 我真鉴赏 is not the right expression 赞助means sponsor,鉴赏 is not a common expression you could say,我很感谢你的帮助

"鉴赏"的对象一般是物，比如是一幅画、一件古董。而且基础中文讲究的句法一般要符合主谓宾的结构，所以也不宜出现 "你的赞助, 我真鉴赏!" ，如果非得用在邀请函一类的正式场合里你可以翻译成“承蒙相助，不胜感激” "鉴赏"is used before something valuable，for example a expensive painting .we are often taught that we should use a sentense as "subject+predicate+object" when we studied chinese in our primary school.If you use it in some very very formol environment,such as wedding inviting letter business letter,you had better translate it into “承蒙相助，不胜感激”

我真的很感激你的帮助！~"感激"比"感谢"more deeply to someone who you want to thank to

你的帮助对我很有用

你的帮助，我真的很感谢！or you can say : 我真的很感谢你的帮助，that is the normal word order.