General synonyms:
* Articulately
* Eloquently
* Vividly
* Passionately
* Emphatically
* Forcefully
* Movingly
* Poignantly
* Warmly
* Engagingly
More specific synonyms:
* Dramatically (for theatrical performances)
* Lyrically (for musical performances)
* Emotionally (for expressing feelings)
* Artfully (for artistic expression)
The best synonym for "expressively" will depend on the specific context of your sentence and the nuance you wish to convey.