For a traditional IRA only, your contribution limit is $8000 or your compensation from working, whichever is less. For self-employment, compensation from working is about 92% of your net profit (that's not exactly correct, see the other answers for the exact formula.)
If you wanted to contribute more you would have to open an SEP-IRA.
https://www.irs.gov/retirement-plans/retirement-plans-faqs-regarding-seps
I don't know the rules and limits as to whether that will work in your situation. I believe, but am not sure, that you can contribute 25% of your compensation to the SEP, and then contribute $8000 to your traditional IRA. In your case that would get you up to about $12,500 in total retirement contributions, if you do the extra work of setting up an SEP-IRA and follow the rules.
