A 28-year-old woman with asthma uses a salbutamol inhaler (SABA) as needed and a low-dose inhaled corticosteroid (ICS) preventer (beclometasone 100mcg BD). She reports using her salbutamol inhaler 4-5 times per week and waking with wheeze once a week. According to the BTS/SIGN Asthma guideline (referenced by NICE), what is the most appropriate next step in her management?