foulestruope mentioned practice.Almost as important, is listening to good players.
      I practice my fiddle using matt crannitch ,geoff bowen ,and the David lyth books this I find helpful to my concertina phrasing ,.
      last night I listened for an hour to trad music on tg4, as well as having practised for three hours.so listening and absorbing, is as important as practise. best wishes.Dick Miles.