I would offer something in return for the employer, because if you take their side it is illogical to give you more just because you would like to. You can tell

I would offer something in return for the employer, because if you take their side it is illogical to give you more just because you would like to. You can tell your employer that "I would like to take more responsibilities" and actually take it even before talking of any raise, then try to ask, at this moment you have proven to be valuable and trustworthy. Earn your raises and direct them for your own growth.