if the motors are in series rewire them to be in parallel
make sure they dont overload the usb - you can blow a fuse inside the computer which is quite hard to replace
if they allready are in parallel there is no much to do without more complex electronics. find another power source
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if you want to power it by usb cable, just add in another one (not an expert in electricity, so dont trust me...research) or just use a higher voltage supply...