Searching for NRF52840 power saving possibilities

Online Power Profiler for BLE show's some option which are available in

Firmware

1. enable the DC/DC instead of the LDO (-DESPR_DCDC_ENABLE=1)

2. enable slow speed external osc (-DESPR_LSE_ENABLE)

3. change advertising interval (-DBLUETOOTH_ADVERTISING_INTERVAL)

NRF class

1. increasing the advertisement interval using NRF.setConnectionInterval(interval)
   eg NRF.setConnectionInterval({minInterval:10,maxInterval:500}); - not sure about this one
   
   

Any further possibilities?