XING offers you the opportunity to extend your inactive Job Ads. To do this, log in to your XING Jobs account, go to ´Job ads´ (1) > ´Inactive´ (2) and click on ´Extend job ad´ (3) for the job ad you want.
In the next window, select the price plan you want under ´Available job ads´ (1) and publish the job ad (2).