How can i get my child support raised?:
Usually, that isn't the question guys are asking... Oh, maybe you aren't the dad, but the mom.  My bad.

If you were the dad:
You could always just give extra money that doesn't go throught the courthouse. 

Otherwise, you can request a review, which takes awhile to complete, but child support offices go to the employer and verify all of the income, and then reevaluates the amount per month owed.

Some states give cost of living increases every year, but some don't.  

Don't listen to the jerks telling you that you should be able to support the child on your own.  You didn't get pregnant on your own, and you sure shouldn't have to support that child on your own.  

Circumstances change throughout life, that's why this evaluation is in place.   Consider if you were both very young when you got pregnant and he was in college or working for minimum wage, but now he's got a decent job.  It goes by a percentage of his income.