How to promote an old Facebook Page?

[Daniel@30]

First, update that page then use below tips on the facebook page:

1) Firstly, It all depends on the quality of the content.
2) Engage with the audience
3) Connect it to the Real World like problems that are going through your content.
4) Be Creative with images and posts.
5) Reply to the important post and messages when required!

HTH!

Creating a contest also helps sometimes.

Yes, It is also the best part of the update.