By now you should be ready to play some songs without relying on the numbers and breath indicators. Once you can recognize the notes from the notation, the best way to develop your reading is by doing lots of it! The most enjoyable way to do this is to read melodies. Here are some to practice. Read each one until you can play it from memory and then close your eyes and concentrate on playing with feeling and a beautiful tone.
The melodies presented here are only a few examples. It is recommended that you purchase a book of song melodies and start learning the ones in C major. By the end of this book, you will understand how to read melodies in all the other keys as well. It is also a good idea to work your way through method books for other wind instruments, particularly flute books, as the lowest note on the flute is middle C - the same as the lowest note on a C Chromatic harmonica.