It totally depends on requirements of managers of specific campaigns. So no one can answer your question. However, the common range from 50 or 100 followers (minimum), good payment campaigns tent to require higher followers, often from 100 and higher. To get more followers, it is very simple. You can follow projects (pariticularly crypto projects), follow their followers, then some of them will follow you back. Consequently, you will have chance to get more followers for free. More and free! Very simple.