Everything STEEZ did, he did for him and his boys in PE (Pro Era).

It’s dope, or “cool” that STEEZ is makin music for and with his friends. “Dope” is a slang word to describe drugs (usually heroin or marijuana) so that’s why fiends (drug addicts) will pay for it (his music). This line also implies that since his music is dope, his fans are addicted to it like drugs.
Notice how STEEZ says “with everything I DO it’s PE all day” and then goes on to spell out the word DOPE.