You can monetize your account by doing branded partnerships, affiliate marketing, direct sales, fan subscriptions, Livestreams and online events. To grow your account you have to stay consistent and engage your audience. Use hashtags and promotions and collaborate with other creators.
Only you can decide if growing your horror reel account is worth your time. Consider your long-term goals: Do you want to build a career in horror content creation? Are you passionate about sharing your creepy vision with the world? If so, the time and effort could be rewarding. However, if you're only interested in quick financial gain, there might be faster routes. But growing to have 1k follower in a week is a strong indicator of potentials.