One more option that is not in the link above is to use a Text Normalize rule in an activity step.
1. Create the Parse Normalize rule and change the Conversion Options dropdown to "Convert To Proper Case." The other options can be left blank and the only change will be the conversion to Proper Case.
2. In the activity, add a Text-Normalize method step with the created Parse Normalize rule. The Name is the Parse Normalize rule name, the Source is the property that needs to have Proper/Camel case, and the Target property is only required if you want the formatted text in a different property than the source for record keeping purposes.
Spaces, punctuation, and numbers all count as separators for words and the first character of every word after a separator will be capitalized.