Second Job Options

So I've got a regular full time job that gets most of the bills paid (20+ an hour.) I have some credit card debt I want to clear, so I've been looking for part-time or on-demand jobs. I've tried doing delivery driving but that only nets about $10 an hour after gas and taxes. Any advice for low commitment or on demand jobs that pay better?

(Edit: my current job is M-F 9-530.)

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