Side hustle in Cybersecurity

I've been thinking to make a side income in however way possible in Cybersecurity. I have a 9-5 job where I do penetration testing, but I also want to explore a side hustle within cyber. Can anyone please help me list out some options I have? Even in freelance pentest as a side hustle, how do others here find their potential client? Kindly suggest your ideas. Thanks in advance! Cheers.