How can How can I forgive my fine

Although your question is not clear, here is the following information:
If you intend to be exempted from the fine for overstaying, in that case you can submit a request for clemency in order to be exempted from the fine for the length of stay.
And if you wish to leave the UAE permanently, you can submit a request to be exempted from half the fine value in return for imposing a ban against you that prevents you from entering the UAE.