If you want to increase the circuit current, you have to reduce the resistance of the circuit!
Because increasing the power supply current is to increase the diameter of the transformer winding coil copper wire, the voltage ratio is the diameter ratio is the length ratio, keep the ratio unchanged, increase the diameter, but also increase the capacity of the auxiliary equipment. So if you want to increase the circuit current, you have to reduce the resistance of the circuit to achieve!
The current can be amplified directly with a transistor amplifier circuit. Input a small current at the base and obtain a large current at the collector. However, only AC can be amplified.