Design a great profile.
Follow photography and editing best practices.
Craft memorable, on-brand captions.
Use hashtags relevant to your niche and audience.
Engage with other users.
Publish Instagram Stories and go live.
Do cross-promotional campaigns with similar accounts
Make Followers on Instagram is craze nowadays.everyone wants more and more followers on Instagram.there is some matters you have to do and you will get more and more followers.
1)Make your profile more attractive and unique.
2)Make sure your account is not private make it public so anyone can follow you very easily.
3)Always posting about new thing you go with post your photos with a unique caption.
4)Publish stories and go live that will make your followers more.
5)You have to keep update on Instagram as well as update your self with new technologies
Aside from what the others have said in here, it's important that you give as well. Follow other accounts. Like and comment. Be active. Create connections. Also, use hashtags so random people can (maybe/maybe not) find you as well.
Instagram is being loved by users and it has become popular. Create an awesome profile. Always post attractive and follow people using the relevant hashtag.