Need Old Relationship Advice?

So me and this girl dated for about 5 years and had a kid. Well she ended up not loving me anymore or something and stared ignoring and not letting me see my kid in another state. I want to try to impress her to make her want to be with me again I know I was always selfish most the time but I really want to change my ways but what are some things I can do as a guy to win her back like how to look or act cause I will be seeing her in the first time in 4 months for my daughters birthday party with all her family there. Should I just not make eye contact with her and act like she’s not a thing or should i just act loving towards her still or should I just act like I always did and how should I look 


Note this relaship ended 4 months ago 

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