I think that there is just a finite way of making money. Offline commerce also hasn’t changed in a very long time. You basically either sell products or offer services. The rest is just about marketing and finding clients. Online commerce didn’t reinvent the wheel, it just moved all these activities on the Internet. While the marketing side has changed over time, the overall principles were always the same.
What will also help your earning potential is to specialize in one style of writing, and maybe even one particular subject. You see, writing on the same subject for hundreds of hours each year makes you an expert on it. To paraphrase Cal Newport, “…you’ll build up a lot of career capital through deliberate practice.” It’s how you become so good that clients can’t ignore you.
Managing Editor. Managing editors supervise and direct editorial teams, including lower-level editors. These jobs are harder to come by and require more of your time, but temporary arrangements look great on your resume. If you lack much formal editing experience, start with smaller blogs and niche publications with modest budgets and limited content needs. Some publications don’t have enough work for a full-time editor, making it feasible to string together a handful of part-time editing gigs or try out a single position to see how it suits you.

If you love to travel and find yourself randomly searching for airfare sales or browsing Lonely Planet, why not carve out a niche for yourself as a private travel agent? My friend, Mark Jackson did just that, making extra money online with his travel consulting side business. Start with word of mouth recommendations from friends who know they can count on you for the cheapest flights, and then move on and create a Facebook or LinkedIn group to invite people who want to stay on top of the latest deals. Eventually you could spin this into a full-time consultancy teaching people how to make their dream trips a reality.
Craigslist. Craigslist is the scrappiest of the major online resale options. Its major perk is its enticing profit potential, thanks to the total lack of listing and selling fees for most items. The disadvantages are many and include potential safety risks and higher chances of nonpayment. If you do choose Craigslist, keep your wits about you and use the buddy system.
Mechanical Turk: Amazon's Mechanical Turk is a resource for doing human-intelligence tasks, or as the site commonly refers to them, HITs. You get paid a very small fee for any given HIT and you'll need a good deal of volume to make a substantial amount of money. But it is a resource you can use in your spare time to generate a small income online. 
EBay. EBay is one of the most popular websites in the world. That means it’s an excellent way to attract lots of eyeballs to your unwanted items, fast. Initially designed as an auction site for DIY sellers, it’s now primarily a venue for fixed-price – and often heavily discounted – sales by professional merchants. As long as you include high-quality photographs and thorough descriptions in your product listings, you can likely break through the noise. EBay’s fee schedule is complex, but as a general rule, expect to lose 10% of your final selling price to the site’s commission.
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