You may post material with your followers on Instagram, which allows them to engage and connect with you. You may also use the search option on Instagram to find people you know and follow them. In order for a private account to be followed, a follow request must be sent in.
Use this third party tool to recover follow request on instagram
If you want to keep your account private, it implies you don't want just anyone following you — anyone who wants to follow you must first send you a request, which you can accept or reject. If you want to make your account public, anyone can follow you without submitting a request.
Note: If you're not interested in increasing your profile, it's usually best to keep it private. If this is the case, you should make your account public so that others can follow you without having to go through a lengthy process.
If you have a private account, each individual who sends you a request will be routed to your follow request in your notifications section, where you can accept or deny their request. Because the buttons are so little, it's easy to mistakenly do the reverse of what you meant while accepting or denying someone's follow.
Have you ever deleted an Instagram follow request by accident?
You won't be able to bring back the request options if you unintentionally deleted someone's follow request. The only method to fix this is to follow them; if their account is secret, they must accept you; if not, you must wait for them to follow you back. There's nothing you can do to bring back their request possibilities if you don't want to follow them but want them to follow you.
Conclusion
The only way you’ll have another chance of accepting their request is if they decide to send you another one. If they don't follow you, you can make them follow you again – your only option is to follow them and wait for them to follow you. You'll be presented with the request options once more, and you can choose to accept it this time.