1. Over the past few years I had born a grudge against my ex-husband for his cheating on me. Today I have found it in my heart to forgive him. Now I feel so liberated. I should have done this years ago.2. I thank you for your help from the bottom of my heart.3. I'm grateful to you from the bottom of my heart.
 find it in my heart to do something from the bottom of my heart這些都是正統的美語說法.我由衷的感謝你 = I'm grateful to you from the bottom of my heart.
The thesis of your essay is completely obscured by your flowery lanuage.