How does one find freelance or contract work? Short or long term would be fine.

I work full time as a data scientist and I have 3 years experience now. I've become significantly more efficient and experienced and I feel that I could take on more work than my company gives me. My boss wouldn't mind if I took some extra work on the side, he's very flexible and I was wondering how people find contracts for short term gigs? Are there any sites in particular people have had success with? What do you typically …

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