Raise amps lower volts or raise both?

I have just begun to read about simple electronics and came across a question that's confusing me.

When considering Ohm's Law (E=IxR), lets take example numbers.

E is the unknown.
I= 3
R= 1 (to keep it simple)

Therefore E= 3x1, so E=3.

Now if I raise the amps by 1 I get this setup:
E is the unknown
I= 4
R= 1

Therefore E= 4x1, so E=4.

Raising the amps in-turn raises the volts.

But I've always heard that "Raise the amps, lower the volts. Raise the volts, lower the amps"

Considering something like a stun gun makes sense of this statement, because it uses high voltage, and if raising the voltage raised the amps then a stun gun wouldn't be a stun gun, but rather a kill gun xD haha.

So what is it that I'm missing? Does Ohm's Law have an exception or is altered by something I haven't learned yet?

Thank you!