For most people, a career search will last many months. You must be methodical throughout and weather both good news and bad. The whole process will take up a lot of time, but it will be an experience from which you will learn a lot about yourself.
If re-contacting, check your original contact is still working there.
From the day you send your first job application, start keeping a job-search diary. Record what you sent to whom and when, and keep copies of job advertisements and covering letters. Having all this information at hand will enable you to keep track of responses received, as well as whom to chase. The diary will also help you to judge if it is time to make contact again, especially ...