One of the best ways to determine who your target audience is to look at who already buys your product or service. How old are they, where do they live, what are their interests? A good way to learn this is through engaging on social or distributing customer surveys.

• Top tips are
• Analise your customer base and identify what kind of person buys from you.
• Be clear on who you don't want as a client.
• Analise your competition.
• Look for the gap in your niche/niches.
• Create personas.

Not sure what a persona is? Identifying people by some or all of the following:

Candidates

Macro Level

• Diligent/High-Volume Job Seekers
• Sporadic/High-Volume Job Seekers
• Diligent/Selective Job Seekers
• Sporadic/Selective Job Seekers

Micro Level

• Skills that match your niche/niches
• Experience that matches your niche/niches
• Employers worked for that matches your employer niche/niches
• Work completed in your niche/niches
• Location
• Hobbies
• Income
• Education level
• Marital status
• Who they trust
• What they read/watch

Employers

Macro Level

• Make High-Volume Hires
• Make Sporadic/High-Volume Hires
• Make Selective Job Seekers Hires
• Make Sporadic/Selective Hires

Micro Level

• Employer Type (Niche).
• Employer Size.
• Company Location/Locations.
• Brand affinity with your own.
• Their employer goals.
• Look at your why you fit matches.
• Look at how your services match their ambitions.
• Identify if you wish to supply them to staff or use them as a source site.
• Does their spending match your growth needs.
• Does their spending match your terms and conditions ambitions.

Here is a great source to read onthe wider subject of personas:

https://blog.hubspot.com/marketing/buyer-persona-research

https://static1.squarespace.com/static/5c5a6fcf0b77bd158e2247dc/t/5c799929085229ac00225293/1551472945091/YHJ-personas.pdf