It is possible to do it by using transformer foil. So you can increase neither decrease with it. But Voltage and Currents are indirectly proportional

your only option is to design A " boost converter " esun tetekmeh mekeyer tichilaleh , dm me am ECE student 😎

Make a transistor based switching to convert dc to ac then u can wind a transformer with a ratio of primary to secondary 1:2.5

Also you could buy a 12v adapter...kalhone DC step up down converter ale at zefmesh 3rd floor 301...gin for small current new