I built up an organic following by being the first to break crypto-related news amongst my followers. I have news alerts set up to give me notifications whenever a story breaks, and I immediately grab the link and post it to my twitter account and use the proper hashtags.

On average, if you can get a few followers per article you share by using proper hashtags, so imagine the type of follower numbers you'll have after doing this repeatedly for a set duration of time.

Also, try to get into some twitter discussions or re-tweet popular twitter personalities and add your own commentary. This could provide some follows from people who align with your thought process who agree with what you say.

The key is to get "real" followers, which can be done organically. If you're persistent, you can easily gain thousands of followers within a year if you keep at it, and without having to pay for a single one.