Expand the range of your playing by adding the same pentatonic notes but at the lower or higher end, in other words, start using the notes from the adjacent octaves. If you don't know what an "octave" is, this is a great occasion to search the web and enrich your knowledge of your musical instrument.
Knowledge of the pentatonic scale covering the entire range of your musical instrument allows you to play both major (more energetic and happy) music in the key of C major, and minor (more emotional and sad) music in the key of A minor (Am). (For blues: you can play blues in the key of E, and minor (sad) blues in the key of Em.)
Important! If you are a beginner harmonica player, you will most likely find it difficult to play on the lower holes of your harmonica. 95% of beginners have this problem. In particular, it can be difficult for you to draw on the 2nd and 3rd holes. This is caused by incorrect breathing. Be prepared to spend some time developing an appropriate breathing technique on your own or with someone else's help before you are able to make those notes sound good.
Hint: paradoxically, the secret of good harmonica breathing is in trying almost not to breathe when playing the instrument.