Need help with Instagram

Hello to all
I started growing 3 instagram accounts with FollowLiker and im happy with daily new followers (300-500) but the problem is the like rate is dropping i dont know why.
For example with 2k followers i had about 200 likes for every post and now i have almos 6k followers but barely 100 likes in a post. Post quality is the same.
Anyone know why is this happening ?