Looking for someone for some small task in Python.

I’ve done all of the standard things to improve my accuracy for my text classification model…so removing punctuation, removing stop words, lower case everything and I decided not to do stemming. I then created a bag off words based on 300 text inputs (each text input having 2-3 sentences). But my accuracy is still high 50s. To improve this accuracy should I double my bag of words count by adding in more text inputs?