或者深刻壹點的： I am very sincerely (most) (truly) grateful to you for your accompanying!
Thank you very much (ever so much) (most sincerely) (indeed) (from the bottom of my heart).
很（非常）（最真誠地）（確實）（衷心）感謝您。
Thank you for contributing so much to ourselves.
感謝您為我們貢獻了這麽多。