Very important not to run out of wind!!

Use of the air button is vital with your concertina,this is usually by your right thumb; sounds like a Lachenal, may need retuning to correct pitch and bellows may or may not need attention, patching or renewing

Try some basic tunes form your head like a mouthorgan and visit a music shop at a festival for concertina tutors or melodeon tutors, often numbered for push pull under the staves/notes