You can be a freelancer, agency, and a client on Upwork. You will use the same account to log in to Upwork but will have separate user profiles. I see that this account that you used to post in the community is a freelancer account. You can create an agency or a client account by following the steps shared on this help article.
I would also like to request that you please update your profile picture. You will need to use a photo that clearly shows your face. Please check this help article to help you improve your freelancer profile. If there's anything else we can help you, please let us know. Thank you.