1st thing that you have to do is to specify your positioning
Then analyze the market structure
After you did that you'll be able to define the most suitable strategy for your business
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To Increase your customer base you should consider the following:
Build brand awareness on social media, Partner with other businesses, Run email marketing campaigns, Provide excellent customer service always, Encourage customer advocacy, Create freemium offers, Adopt customer service tools, Collect customer feedback.
Hope this will help