Lawyer recommendation for Child Support

Hi, I've been receiving child support for 7 years as if I am earning my previous salary (before I had my 12-year-old child), however I have not worked since our divorce in 2013.

I agreed and received a fixed child support amount (super low) so that I could travel outside the country with my child in return for it.

Do you have any local Lawyer recommendations to change the child support amount (preferably not too expensive).