What are my odds of getting this schedule amended or getting even full custody?

My ex husband is 22 years older than I. Me being 25 years old I suppose I went into this divorce quite blindsided. I truly felt my ex was a good father and it was in the best interest of my children to be equally involved in both our lives. Since divorce he has become quite mean toward me yelling at me in front of children during exchanges. He recently threatened to kill me verbally over the phone. I entered an order for protection into the court and the judge found no imminent harm and didn't award it. He explained we needed to learn to co parent. He doesn't apply rules for our children 6 and 2. No structure at his home. He doesn't follow parenting schedule there with me more than decree says 55%_45% me with the higher amount. We transition on Thursday after school me having children sun night 7 till Thursday 3 him the rest of the time also dad getting a wed 4-8 visit. With this said my 6 year old gets off bus at 5 and starting bed at 930. This being kindergarten and first year of school I didn't realize how little time I’d truly see him. It’s really only a total of 11.5 hours per week. It's so hard and unfair that I don’t see him. Dad with weekends and Wednesday visit seeing him the almost entire amount of his parenting time. Not only is dad not providing structure during this time, and being verbally abusive towards me in front of our children and he gets so much more time with our 6 year old. I need this order changed. I voluntarily went into this agreement being and dumb not considering how little time is actually see my son and in the future both (2 year old will start kindergarten). How wrong of a decision this schedule was. How naive I was. This agreement was signed by the judge in July this year.