How do I ask my boss for more hours at work?

I’ve been working part time at my job for almost 4 years. I have opened up my availability as much as possible for my manager, and am able to work all positions. I am more than able to work many of the typical shifts available. I used to get around 15-25 hours per week, but recently I have only been receiving 7-8... show more I’ve been working part time at my job for almost 4 years. I have opened up my availability as much as possible for my manager, and am able to work all positions. I am more than able to work many of the typical shifts available. I used to get around 15-25 hours per week, but recently I have only been receiving 7-8 hours per week. My manager seems to be pretty petty when giving out hours, and will cut hours for next to no reason. How do I talk to my petty manager about getting more hours without having my hours cut even more?
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