For unique hashtags, start getting the word out by asking friends and family members to use it in their personal posts. Write a post about it on your own social media accounts to get the word out to your followers. Consider writing a blog post to promote the hashtag, and linking it in your social media posts. To further your hashtag even more, consider asking a social media influencer to use it in their posts. This will get even more eyes on your hashtag. Search for your hashtag on different social media sites to see how well it's performing. Add responses to posts that use your hashtag to encourage more community engagement. Use an analytics tools like Keyhole or Tweetreach to get data on the success of your hashtag.Pay attention to the audience that your hashtag is reaching, and specifically the age group. Think about what content you can post to gain a bigger following in other age groups or communities, and how to keep the attention of the followers you've already attracted.

Summary:
Ask your friends and followers to use your hashtag. Track the usage of your hashtag with an analytics tool.