Can i start any consultancy for email marketing as i have 5 years of experience. “I will not promote “

Hi I have 5 years of experience in email marketing and have worked on Marketo Hubspot and many automation tools and now i am thinking of starting something on my own. So i would like to understand that would be the right decision or not and if not then what are other options that can be explored. Any suggestions is highly appreciated as it will help me perusing the right path.