Now that you’ve learned how to play all the draw bends, blow bends, overblows and overdraws you should be able to put it all together and play the chromatic scale! Playing the chromatic scale is a great challenge for the harp player because you’ll need to use all those techniques to play it.
Also what it means is that your now playing every note there is to play! (in western music anyway), so regardless of key or style of music, you have all the notes right there at your disposal.
The next big challenge will be trying to develop some freedom in playing chromatically, playing in different keys and developing the ear to hear those semitones. Having these tools is just the start, to develop musicality and artistic expression is a life long quest.