The following is a list of tips and recommendations to help you increase the number of conversions for your campaigns:
If you're willing to spend more on your advertising, and you're currently hitting your budget on a regular basis, you can increase your budget.
If you're willing to spend more on your advertising, but you're not hitting your budget, you can increase your cost-per-click (CPC) bids for the the affected campaigns. Higher bids help increase your ad rank, which leads to greater visibility for your ad. With more visibility, you're likely to get more clicks that lead to conversions.
Combine your campaign with another campaign for a related product that has a similar conversion rate.