Growing Twitter

Hello I am working on growing several instagram and twitter accounts but the focus of this thread is twitter.

I have 4 accounts in the following niches,
-adult
-cars
-clothing
-memes

I post 3 times a day on all of them and follow and like other people. My question is what is the next step to growing these accounts? Wether it is connecting with other account owners in the same verticals or using bots i am not sure. Please let me know thanks!

not an expert on either , can only link u to there 2 sub sections
https://www.blackhatworld.com/forums/twitter.210/
https://www.blackhatworld.com/forums/instagram.215/