What is another word for was on track of?
Pronunciation: [wɒz ˌɒn tɹˈak ɒv] (IPA) 
When you are trying to express that something was heading in the right direction or making progress, there are a number of synonyms that you could use instead of "was on track of". For example, you could say that something was on the right path, was making headway, was moving in the right direction, was making strides, or was progressing well. Other options might include that something was developing positively, was gaining momentum, was advancing, was flourishing, or was thriving. All of these synonyms offer different nuances and shades of meaning, so you may want to choose the one that best fits the particular situation you are describing.
