voucher running out before use

I was told adcenter voucher lasted 3 months after account activation.
If CTR rate is very low how to use the voucher before it expired ?

 

I would suggest adding more ads and add more related keywords.

 

optimize the ads, make them more appealing, add more targeted keywords, and if these do not work, increase the bids to get higher positions [but remember to set a daily limit], cuz the credit is gonna expire anyways.