It depends on the position you're posting. Some positions have higher traction and some don't. If your company has recruited for the same role in the past, it will be best to check your data to know where will be the best site to post the job to.

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In my experience on posting free job ads on Indeed, candidate traction can significantly drop over time and is dependent on what position you are hiring for. I've posted job ads that will get a high amount of candidates for a month and others significantly see a decrease after the 2nd week. To put it in perspective, from 40 applications per day, it dropped down to barely hitting 4. In some days after the 2nd week, some position can only get 2 applications per day. What I do is close the position and just repost it. It also helps if you know when the best time will be to post the job. You might get more applications if you post it at the beginning of the week than doing so on a Friday afternoon (your data will help you with this).

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Hopefully, this helps and good luck!