Designing a Transformerless power supply
If C1 was directly connected across L and N and takes a current of 80mA when the input voltage is 220V AC, then that is the limit of this circuit. Using a "transformer" is the only way you can increase this current. 

By "transformer" I mean a conventional magnetic coupled transformer or a switching regulator that may or may not use a transformer.

If you are intent on pursuing this approach you'd need to have a capacitor value of at least 10uF - at 50Hz it's impedance is 318 ohms and with 220V across it there will be a current of about 0.7A.