Hey, just a quick advice for those who wants to go further with that method:
1) Go to Twitter
2) Search for both Hashtags: #follow4follow #crypto (or you can use #followback as well for the 1st item, and #bitcoin or #altcoin or whatever crypto-related hashtag for the 2nd one), and look for the "people" tab.
You can yet follow all those people in that list
3) In that list of people, look for one that got more than 1,000 followers (if he got 5000 followers or more, it's better !)
4) Follow him/her and check their followers.
Usually, they used the same method to gather their followers, so they are full of "follow4follow" related to crypto.
5) Follow all those who got a "followwhatever" hashtag in their bio.
6) Be careful about the number of people you follow each day. I've done that by following about 800 accounts in 2 hours. Now my account is blocked for 3 days.
But I can tell you that you can do 500 followings for your 1st session without any problem, I just can't tell you when you will be able to do it again.
7) Wait for the opther people to follow you. You will see that every few minutes, another follower follow you.
Hope that it will give you lots of followers !
Happy following to everyone !