Q - to raise awareness of what you're advertising without limiting who might see your ads, you should:

to raise awareness of what you’re advertising without limiting who might see your ads, you should: add multiple targeting methods and use the "Bid only" setting

The bid only setting oculd be used to target a specific demographic that is suitable for your product. For example, if you're selling baby's clothing, it will be more efficient to target the women between the age of 30-45 as your advertising target