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A blogpost that is popular even after months of its publishing should not be tampered with much. Still if you need to bring back into spotlight then you can post a little update on the topic on which the post was written.
The nature of internet is such that things keep on changing, use this very opportunity to insert some update. But be careful that you do not end up changing too much of the content of the original blogpost.
If there have been major changes since the post was written then you can write a new blogpost on these new changes. You can provide a link for your old popular post within this new post. As you might be knowing this is internal linking which is loved very much by Google.
