As you all know in freelancing all clients see reviews before they pay for your service that's make some difficulties for new freelancers to get their first orders 

Solution- you can give them a offer that "if you don't like my service don't pay me" I know by doing this you may not get paid in starting but think about it after some order you get your your reviews and a profile that other clients can trust 

If your niche is like web development, android development, video editing, digital marketing, etc then you can achieve this target with first 1 to 3 projects. Make sure that your skills are polished. 

If your buyers start trusting you then you can easily multiply you revenue. 

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But what about skills which are selling in $5 to $50 or less $100? 

So, these type of freelancers should upgrade themselves because such type of skills are not futuristic and after some decades AI will neglect such jobs.

So try to learn powerful skills. H-educate also comes with those type of videos where you can find upcoming trending skills.