Last year @diaryofafitmommyofficial was commenting on every celebrities post and because she was verified her comments were stuck to the top, bottom of every single post. She supposedly grew 70k+ by just commenting. She annoyed everyone, but she’s at 1.2 million now.
That is a effective way if done correctly … Must be unique and the followers if that account should see it and hopefully like the comment too, however it is less effective than a year ago. No harm in trying