How to Increase product conversion on Shopify Website?

About LEDSone:

LEDSone aims to provide a variety of Retro Industrial Lighting Products in your Shopping. We are Keen in our customers’ Satisfaction in antique old fashion home and café lighting. LEDSone as a leading Vintage Lighting supplier based in Coventry will help customers in finding their exact needs at a wholesale price. Take part in weekly Great deals and frequent Special Offers. Enjoy shopping with us and get the best modern and industrial lighting experience that enriches your life.

Our website traffic is good but conversion percentage is very low, How to increase the conversion on website?

Which is best choice for an Ad? 

1.Social Media Ad

2.Google Ad