How to use PPC effectively if competitors are much better than us?

I’ve a client which sell products with the highest price compared to all competitors amd also shipping days are much more than competitors
Client is not ready to compromise on shipping days or price
In 3 months I’ve modified PPC campaigns to acheive CTR above 3% compared to 0.5% earlier also the bounce rate has reduced to 45% compared to 67%
Still no increase in sales

See original post by Crazymady