“Is it possible for someone to actually improve in forgiveness? If so what do you suggest as some keys for me to do that?”
Forgiveness is not a superficial action (such as saying, “It’s ok” when someone is unfair to you). Instead, it is a moral virtue, as is justice and kindness and love. Aristotle told us thousands of years ago that one challenge in life is to become more perfected in the virtues. In other words, we do grow more proficient in our understanding and expression of the virtues, but only if we practice them. It is a struggle to grow in any virtue, including forgiveness. So, first be aware that you can grow in this virtue. Then be willing to practice it, with the goal of maturing in love, which is what forgiveness is (loving those who are unkind to us). You need a strong will to keep persevering in the struggle to grow in forgiveness. In sum, you need: understanding of what forgiveness is, practice, a strong will, and keeping your eye fixed on the goal of improving in love a little more each day.
For additional information, see On the Importance of Perseverance when Forgiving.