Sounds like you are in a position to ask for more money. If they say no. Work while you find another job, Quit, and leave them fucked. They don't see your value and are extorting your labor.

Know your value.

Don't remain humble.

Staying humble, is the opposite of having confidence in your abilities, thoughts and actions because of how others might perceive you.

Staying humble is staying poor.

Staying humble gets you used.

Staying humble leads to no growth.