How to advertise a new product?

Many people encounter the same situation as you when it comes to new products: they spend money but get few orders. This is the case no matter how accurate the keywords are, unless the product is really good.
Some routines currently on the market
1. Off-site - Request for reviews - Advertisement - Low price
2. Evaluation
 
There is only one key point: solve the conversion rate problem in the early stage, and it will be easier to get orders from advertising in the later stage.