Sorry for not sugar coating it for you.
The more fake followers you purchased on an account the more damage that has been done to your engagement, and the harder it will be to recover it to a neutral state. Fake followers almost always drop over time, which will in fact increase your engagement rate slowly. If the fake followers are not dropping, then it would be better to create a second account to take over your main account if you cant restore it. You can refer to this post for more details How to increase your Instagram Follower Activity?! - #12 by BrandonBerner
With shop or business accounts that dont have any good content to post (baby blankets), there is not really a point in trying to get lots of engagement since you dont really have anything visually to offer. The point of a business account with no good content to post is to showcase your products, gain the trust of potential customers, and generate additional traffic to your website and hopefully more sales. In this case, buying followers would increase your authority and gain the trust of your potential customers thus making it a good option to buy fake followers. In addition if you are following targeted users daily on this account, they will see your follow request, look at the profile, see how many followers you have (lots if you purchased more followers), and if its high, they will have more trust when clicking your link out of curiosity.
You can also choose to create a new account (Highly recommended), which post daily tips for new mothers, and motivational pictures. This would grow much better than your store account. Grow it naturally and organically without buying followers on this account. In the BIO share your store account, and post an occasional picture promoting your store/store account. This account will be your promoting account.
AddMeFast and other platforms like this all contain a high amount of bot/fake accounts also. If you were to send followers to your accounts, you will notice most of the accounts have little to no posted pictures, and are following thosuands of accounts. This is because in order for Person A to get likes on their account, they need to first like/follow Person B. Person A does not want their follwing count to be 6,000 followers, so instead Person A will create a new account, and use this one to like/follow other accounts on AddMeFast to gain points. Then use the AddMeFast points to send likes/followers to their main account.
In short, AddMeFast is NOT better than buying fake followers from a different source.