Here are a few tips and ways for you to engage your current followers
1) Follow them back-
following your followers back will give them the feeling that they are important to you and they will appreciate your effort.
2) Sharing their content –
While many social media users have come to expect the occasional message or follow-back, very few expect to be called out by name. Sharing a piece of relevant content from a new follower, be it a Facebook post, Instagram photo or YouTube video, can be a significant moment for that individual.
3) Organize a contest-
You can organize some competitions to engage your followers and can give small prizes or shout out to the winner.
If you are a clothing brand or an accessories related business, you can hold some giveaway contest from time to time to maintain the interest of your followers. If you are a consultancy or an event management brand you can organize some free 4 minutes call with the experts etc.
5) Guessing games-
you can engage your customers by organizing some guessing games about the new product you are about to launch. You can provide some hints related to the product and let your customers race the memory horse to guess the answers.