How to save a relationship

Here’s my question.

How do you guys try to make things work out when you guys broke up for almost a year? We do have a 1 year old together but how do you bring back the spark ? And fall inlove again I guess lol like we know we want to be together but so much negative things has happened and has been said. We were together for 4 years so. We broke up due to not getting along no cheating or nothing like that.