Reduction of stress which can contribute to reducing heartburn symptoms
Take regular exercise and losing weight can often help. However be mindful that certain exercises such as stomach crunches can push acid out of the stomach causing heartburn
Reducing portion size and avoiding big meals close to laying down / going to sleep.
If you smoke, try to cut down or quit as smoking relaxes the valve at the top of your stomach, allowing excess stomach acid to reflux into your oesophagus.