I am willing to contribute everything I have to you.这句话语法有无错误.麻烦可以改进一下使得它更加本土.

是:我愿意为你付出一切,还是,我愿意为你效劳?
如果是前者(对爱人说):I am willing to do everything for you.I would sacrifice for you.
如果是后者(对上司,或他人,语境正式):I am glad to be of some assistance.
或:I am glad to have been of some service.