Dictionary gives the same synonym "continue" to all af the "go on", "carry on", "keep on". There was no difference to me till now. I need to write a sentence like:

We have decided to [carry/keep/go] on using free version of this software.

And [go on] does not sound comfortable to me in this case. Am I right?

My dictionary gives all of the "go on", "carry on", "keep on" as the same synonym for "continue". There was no difference to me till now. I need to write a sentence like:

We have decided to [carry/keep/go] on using free version of this software.

And [go on] does not sound comfortable to me in this case. Am I right?