Google is your best friend if you are trying to increase both your sales and brand awareness.
Use Social Media to it's full potential and be a voice of authority in your industry or specialised field.
Google Ads is an effective tool but also costly. You want to be building an organic audience and traffic to your website and social media channels.
The key to any online business is Customer Service. Ebay shop owners heavily rely on their 'Seller Ratings' therefore responding to Ebay messages as quickly and professional is crucial for their bottom line.